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Glišić D, Milićević V, Krnjaić D, Toplak I, Prodanović R, Gallardo C, Radojičić S. Genetic analysis reveals multiple intergenic region and central variable region in the African swine fever virus variants circulating in Serbia. Vet Res Commun 2023; 47:1925-1936. [PMID: 37256519 DOI: 10.1007/s11259-023-10145-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 05/22/2023] [Indexed: 06/01/2023]
Abstract
This study provides the first comprehensive report on the molecular characteristics of African swine fever virus (ASFV) variants in Serbia between 2019 and 2022. Since its first observation in July 2019, the disease has been found in wild boar and domestic swine. The study involved the analysis of 95 ASFV-positive samples collected from 12 infected administrative districts in Serbia. Partial four genomic regions were genetically characterized, including B646L, E183L, B602L, and the intergenic region (IGR) between the I73R-I329L genes. The results of the study suggest that multiple ASFV strains belonging to genotype II are circulating in Serbia, as evidenced by the analysis of the IGR between I73R-I329L genes that showed the most differences. Furthermore, the phylogenetic analysis of the B602L gene showed three different clades within the CVR I group of ASFV strains. Regarding the IGR, 98.4% were grouped into IGR II, with only one positive sample grouped into the IGR III group. These findings provide essential insights into the molecular characteristics of ASFV variants in Serbia and contribute to the knowledge of circulating strains of ASFV in Europe. However, further research is necessary to gain a better understanding of ASFV spread and evolution.
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Affiliation(s)
- Dimitrije Glišić
- Department of Virology, Institute of Veterinary Medicine of Serbia, 11000, Belgrade, Serbia.
| | - Vesna Milićević
- Department of Virology, Institute of Veterinary Medicine of Serbia, 11000, Belgrade, Serbia
| | - Dejan Krnjaić
- Department of Microbiology and Immunology, University of Belgrade Faculty of Veterinary Medicine, 11000, Belgrade, Serbia
| | - Ivan Toplak
- Institute of Microbiology and Parasitology, Laboratory for Virology, Veterinary Faculty, 1000, Ljubljana, Slovenia
| | - Radiša Prodanović
- Department of Ruminants and Swine Diseases, University of Belgrade Faculty of Veterinary Medicine, 11000, Belgrade, Serbia
| | - Carmina Gallardo
- European Union Reference Laboratory for ASF (EURL-ASF): Centro de Investigación en Sanidad Animal (CISA-INIA, CSIC), Valdeolmos, Madrid, Spain
| | - Sonja Radojičić
- Department of Infectious Animals Diseases and Diseases of Bees, University of Belgrade Faculty of Veterinary Medicine, 11000, Belgrade, Serbia
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2
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Černe D, Hostnik P, Toplak I, Presetnik P, Maurer-Wernig J, Kuhar U. Discovery of a novel bat lyssavirus in a Long-fingered bat (Myotis capaccinii) from Slovenia. PLoS Negl Trop Dis 2023; 17:e0011420. [PMID: 37384601 DOI: 10.1371/journal.pntd.0011420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 05/25/2023] [Indexed: 07/01/2023] Open
Abstract
Lyssaviruses are the causative agents of rabies, a zoonotic, fatal disease that is thought to be ancestral to bats. In the last decade, the detection of bat associated lyssaviruses is increasing also in Europe. Within a retrospective bat associated lyssavirus surveillance study a total of 225 dead bats of 21 bat species were collected in Slovenia between 2012 and 2019 and tested by specific real-time RT-PCR method. The first lyssavirus positive sample in bats in Slovenia was detected using the real-time RT-PCR, the fluorescent antibody test, and next generation sequencing, while the rabies tissue culture inoculation test was unsuccessful due to sample degradation and storage conditions. The nearly complete genome of Divača bat lyssavirus from Slovenia consists of 11,871 nucleotides and reflects the characteristic gene organization known for lyssaviruses, encoding the five viral proteins. Phylogenetic analysis of Divača bat lyssavirus revealed that it belongs to phylogroup I lyssaviruses and is most closely related to Kotalahti bat lyssavirus (KBLV) with 87.20% nucleotide and 99.22% amino acid identity. Together with KBLV, Khujand virus, European bat lyssavirus 2, Bakeloh bat lyssavirus, and Aravan virus, Divača bat lyssavirus was detected in the genus Myotis suggesting its key role in the transmission and maintenance of certain lyssaviruses.
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Affiliation(s)
- Danijela Černe
- Institute of Microbiology and Parasitology, Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Peter Hostnik
- Institute of Microbiology and Parasitology, Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Ivan Toplak
- Institute of Microbiology and Parasitology, Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Primož Presetnik
- Centre for Cartography of Fauna and Flora, Ljubljana office, Ljubljana, Slovenia
| | - Jedrt Maurer-Wernig
- Administration of the Republic of Slovenia for food safety, veterinary sector, and plant protection, Ljubljana, Slovenia
| | - Urška Kuhar
- Institute of Microbiology and Parasitology, Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
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3
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Pislak Ocepek M, Glavan G, Verovnik R, Šimenc L, Toplak I. First Detection of Honeybee Pathogenic Viruses in Butterflies. Insects 2022; 13:925. [PMID: 36292873 PMCID: PMC9604290 DOI: 10.3390/insects13100925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 10/06/2022] [Accepted: 10/10/2022] [Indexed: 06/16/2023]
Abstract
Several pathogens are important causes of the observed pollinator decline, some of which could be transmitted between different pollinator species. To determine whether honeybee viruses can be transmitted to butterflies, a total of 120 butterflies were sampled at four locations in Slovenia. At each location, butterflies from three families (Pieridae, Nymphalidae, Hesperiidae/Lycenidae) and Carniolan honeybees (Apis mellifera carnica) were collected. The RNA of six honeybee viruses, i.e., acute bee paralysis virus (ABPV), black queen cell virus (BQCV), chronic bee paralysis virus (CBPV), deformed wing virus A (DWV-A), Sacbrood bee virus (SBV), and Lake Sinai virus 3 (LSV3), was detected by a specific quantitative method (RT-PCR). The presence of ABPV, BQCV, LSV3, and SBV was detected in both butterflies and honeybees. All butterfly and bee samples were negative for CBPV, while DWV-A was detected only in honeybees. The viral load in the positive butterfly samples was much lower than in the positive bee samples, which could indicate that butterflies are passive carriers of bee viruses. The percentage of positive butterfly samples was higher when the butterflies were collected at sampling sites with a higher density of apiaries. Therefore, we believe that infected bees are a necessary condition for the presence of viruses in cohabiting butterflies. This is the first study on the presence of pathogenic bee viruses in butterflies.
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Affiliation(s)
- Metka Pislak Ocepek
- Institute of Pathology, Wild Animals, Fish and Bees, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Gordana Glavan
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia
| | - Rudi Verovnik
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia
| | - Laura Šimenc
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Ivan Toplak
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
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4
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Hodnik JJ, Acinger-Rogić Ž, Alishani M, Autio T, Balseiro A, Berezowski J, Carmo LP, Chaligiannis I, Conrady B, Costa L, Cvetkovikj I, Davidov I, Dispas M, Djadjovski I, Duarte EL, Faverjon C, Fourichon C, Frössling J, Gerilovych A, Gethmann J, Gomes J, Graham D, Guelbenzu M, Gunn GJ, Henry MK, Hopp P, Houe H, Irimia E, Ježek J, Juste RA, Kalaitzakis E, Kaler J, Kaplan S, Kostoulas P, Kovalenko K, Kneževič N, Knific T, Koleci X, Madouasse A, Malakauskas A, Mandelik R, Meletis E, Mincu M, Mõtus K, Muñoz-Gómez V, Niculae M, Nikitović J, Ocepek M, Tangen-Opsal M, Ózsvári L, Papadopoulos D, Papadopoulos T, Pelkonen S, Polak MP, Pozzato N, Rapaliuté E, Ribbens S, Niza-Ribeiro J, Roch FF, Rosenbaum Nielsen L, Saez JL, Nielsen SS, van Schaik G, Schwan E, Sekovska B, Starič J, Strain S, Šatran P, Šerić-Haračić S, Tamminen LM, Thulke HH, Toplak I, Tuunainen E, Verner S, Vilček Š, Yildiz R, Santman-Berends IMGA. Corrigendum: Overview of Cattle Diseases Listed Under Category C, D or E in the Animal Health Law for Which Control Programmes Are in Place Within Europe. Front Vet Sci 2022; 9:902559. [PMID: 35529840 PMCID: PMC9070405 DOI: 10.3389/fvets.2022.902559] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 03/23/2022] [Indexed: 11/24/2022] Open
Affiliation(s)
- Jaka Jakob Hodnik
- Clinic for Reproduction and Large Animals - Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Žaklin Acinger-Rogić
- Veterinary and Food Safety Directorate, Ministry of Agriculture, Zagreb, Croatia
| | - Mentor Alishani
- Department of Veterinary Medicine, Faculty of Agriculture and Veterinary, University of Prishtina "Hasan Prishtina", Prishtina, Albania
| | - Tiina Autio
- Finnish Food Authority, Veterinary Bacteriology and Pathology Unit, Kuopio, Finland
| | - Ana Balseiro
- Animal Health Department, University of León, León, Spain.,Animal Health Department, Instituto de Ganadería de Montaña Consejo Superior de Investigaciones Científicas-University of León, León, Spain
| | - John Berezowski
- Veterinary Public Health Institute, Vetsuisse, University of Bern, Bern, Switzerland
| | - Luís Pedro Carmo
- Veterinary Public Health Institute, Vetsuisse, University of Bern, Bern, Switzerland
| | - Ilias Chaligiannis
- School of Veterinary Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Beate Conrady
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.,Complexity Science Hub Vienna, Vienna, Austria
| | - Lina Costa
- Department of Agrarian and Veterinary Sciences, Agrarian School of Elvas, Polytechnic Institute of Portalegre, Portalegre, Portugal
| | - Iskra Cvetkovikj
- Faculty of Veterinary Medicine in Skopje, Ss Cyril and Methodius University in Skopje, Skopje, Macedonia
| | - Ivana Davidov
- Faculty of Agriculture, University of Novi Sad, Novi Sad, Serbia
| | | | - Igor Djadjovski
- Faculty of Veterinary Medicine in Skopje, Ss Cyril and Methodius University in Skopje, Skopje, Macedonia
| | - Elsa Leclerc Duarte
- Departamento de Medicina Veterinária, Mediterranean Institute for Agriculture, Environment and Development, Universidade de Évora, Évora, Portugal
| | | | | | - Jenny Frössling
- Department of Disease Control and Epidemiology, National Veterinary Institute (SVA), Uppsala, Sweden.,Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Skara, Sweden
| | - Anton Gerilovych
- National Scientific Centre, Institute for Experimental and Clinical Veterinary Medicine, Kharkiv, Ukraine
| | - Jörn Gethmann
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Epidemiology, Greifswald, Germany
| | - Jacinto Gomes
- Animal Health and Production Unit, National Institute for Agrarian and Veterinary Research, Oeiras, Portugal
| | - David Graham
- Animal Health Ireland, Carrick on Shannon, Ireland
| | | | - George J Gunn
- Epidemiology Research Unit, Department of Veterinary and Animal Science, Northern Faculty, Scotland's Rural College, Inverness, United Kingdom
| | - Madeleine K Henry
- Epidemiology Research Unit, Department of Veterinary and Animal Science, Northern Faculty, Scotland's Rural College, Inverness, United Kingdom
| | - Petter Hopp
- Section of Epidemiology, Norwegian Veterinary Institute (NVI), Oslo, Norway
| | - Hans Houe
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Elena Irimia
- Research and Development Institute for Bovine Balotesti, Balotesti, Romania
| | - Jožica Ježek
- Clinic for Reproduction and Large Animals - Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Ramon A Juste
- Department of Animal Health, NEIKER-Basque Institute for Agricultural Research and Development, Basque Research and Technology Alliance, Derio, Spain
| | - Emmanouil Kalaitzakis
- Clinic of Farm Animals, Veterinary Faculty, Aristotle University Thessaloniki, Thessaloniki, Greece
| | - Jasmeet Kaler
- School of Veterinary Medicine and Science, University of Nottingham, Nottingham, United Kingdom
| | - Selcuk Kaplan
- Department of Genetics, Faculty of Veterinary Medicine, Tekirdag Namik Kemal University, Tekirdag, Turkey
| | - Polychronis Kostoulas
- Laboratory of Epidemiology, Faculty of Public and One (Integrated) Health, School of Health Sciences, University of Thessaly, Karditsa, Greece
| | - Kaspars Kovalenko
- Faculty of Veterinary Medicine, Latvia University of Lifesciences and Technologies, Jelgava, Latvia
| | - Nada Kneževič
- Podravka Food Industry, Research and Development, Koprivnica, Croatia
| | - Tanja Knific
- Veterinary Faculty, Institute of Food Safety, Feed and Environment, University of Ljubljana, Ljubljana, Slovenia
| | - Xhelil Koleci
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Agricultural University of Tirana, Tirana, Albania
| | | | - Alvydas Malakauskas
- Department of Veterinary Pathobiology, Lithuanian University of Health Sciences, Veterinary Academy, Kaunas, Lithuania
| | - Rene Mandelik
- Department of Epizootiology, Parasitology and Protection of One Health, University of Veterinary Medicine and Pharmacy, Kosice, Slovakia
| | - Eleftherios Meletis
- Laboratory of Epidemiology, Faculty of Public and One (Integrated) Health, School of Health Sciences, University of Thessaly, Karditsa, Greece
| | - Madalina Mincu
- Research and Development Institute for Bovine Balotesti, Balotesti, Romania
| | - Kerli Mõtus
- Institute of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences, Tartu, Estonia
| | - Violeta Muñoz-Gómez
- Section of Epidemiology, Vetsuisse Faculty, University of Zürich, Zurich, Switzerland
| | - Mihaela Niculae
- Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Cluj-Napoca, Romania
| | - Jelena Nikitović
- Institute for Genetic Resources, University of Banja Luka, Banja Luka, Bosnia and Herzegovina
| | - Matjaž Ocepek
- Veterinary Faculty, National Veterinary Institute, University of Ljubljana, Ljubljana, Slovenia
| | | | - László Ózsvári
- Department of Veterinary Forensics and Economics, University of Veterinary Medicine Budapest, Budapest, Hungary
| | - Dimitrios Papadopoulos
- Department of Microbiology, Faculty of Veterinary Medicine, Aristoteles University of Thessaloniki, Thessaloniki, Greece
| | - Theofilos Papadopoulos
- Department of Microbiology, Faculty of Veterinary Medicine, Aristoteles University of Thessaloniki, Thessaloniki, Greece
| | - Sinikka Pelkonen
- Finnish Food Authority, Veterinary Bacteriology and Pathology Unit, Kuopio, Finland
| | | | - Nicola Pozzato
- Laboratorio di Medicina Forense Veterinaria, Struttura Complessa Territoriale 1 - Verona e Vicenza, Istituto Zooprofilattico Sperimentale Delle Venezie, Vicenza, Italy
| | - Eglé Rapaliuté
- Department of Veterinary Pathobiology, Lithuanian University of Health Sciences, Veterinary Academy, Kaunas, Lithuania
| | | | - João Niza-Ribeiro
- Department of Population Studies, Institute of Biomedical Sciences Abel Salazar, University of Porto, Porto, Portugal
| | - Franz-Ferdinand Roch
- Unit of Food Microbiology, Institute for Food Safety, Food Technology and Veterinary Public Health, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Liza Rosenbaum Nielsen
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jose Luis Saez
- Ministry of Agriculture, Fisheries and Food, Madrid, Spain
| | - Søren Saxmose Nielsen
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Gerdien van Schaik
- Department of Population Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands.,Royal GD, Deventer, Netherlands
| | | | - Blagica Sekovska
- Faculty of Veterinary Medicine in Skopje, Ss Cyril and Methodius University in Skopje, Skopje, Macedonia
| | - Jože Starič
- Clinic for Reproduction and Large Animals - Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Sam Strain
- Animal Health and Welfare Northern Ireland, Dungannon, United Kingdom
| | - Petr Šatran
- State Veterinary Administration, Prague, Czechia
| | - Sabina Šerić-Haračić
- Animal Health Economics Department, Veterinary Faculty of the University of Sarajevo, Sarajevo, Bosnia and Herzegovina
| | | | - Hans-Hermann Thulke
- Department of Ecological Modelling, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
| | - Ivan Toplak
- Department of Virology, Veterinary Faculty, Institute of Microbiology and Parasitology, University of Ljubljana, Ljubljana, Slovenia
| | | | - Sharon Verner
- Animal Health and Welfare Northern Ireland, Dungannon, United Kingdom
| | - Štefan Vilček
- Department of Epizootiology, Parasitology and Protection of One Health, University of Veterinary Medicine and Pharmacy, Kosice, Slovakia
| | - Ramazan Yildiz
- Department of Internal Medicine, Faculty of Veterinary Medicine, Burdur Mehmet Akif Ersoy University, Burdur, Turkey
| | - Inge M G A Santman-Berends
- Department of Population Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands.,Royal GD, Deventer, Netherlands
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Hodnik JJ, Knific T, Starič J, Toplak I, Ocepek M, Hostnik P, Ježek J. Corrigendum: Overview of Slovenian Control Programmes for Selected Cattle Diseases, Listed Under Category C, D or E of the European Animal Health Law. Front Vet Sci 2022; 8:835395. [PMID: 35097058 PMCID: PMC8790675 DOI: 10.3389/fvets.2021.835395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 12/15/2021] [Indexed: 12/04/2022] Open
Affiliation(s)
- Jaka Jakob Hodnik
- Clinic for Reproduction and Large Animals—Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
- *Correspondence: Jaka Jakob Hodnik
| | - Tanja Knific
- Institute of Food Safety, Feed and Environment, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Jože Starič
- Clinic for Reproduction and Large Animals—Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Ivan Toplak
- Department of Virology, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Matjaž Ocepek
- National Veterinary Institute, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Peter Hostnik
- Department of Virology, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Jožica Ježek
- Clinic for Reproduction and Large Animals—Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
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6
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Hodnik JJ, Acinger-Rogić Ž, Alishani M, Autio T, Balseiro A, Berezowski J, Carmo LP, Chaligiannis I, Conrady B, Costa L, Cvetkovikj I, Davidov I, Dispas M, Djadjovski I, Duarte EL, Faverjon C, Fourichon C, Frössling J, Gerilovych A, Gethmann J, Gomes J, Graham D, Guelbenzu M, Gunn GJ, Henry MK, Hopp P, Houe H, Irimia E, Ježek J, Juste RA, Kalaitzakis E, Kaler J, Kaplan S, Kostoulas P, Kovalenko K, Kneževič N, Knific T, Koleci X, Madouasse A, Malakauskas A, Mandelik R, Meletis E, Mincu M, Mõtus K, Muñoz-Gómez V, Niculae M, Nikitović J, Ocepek M, Tangen-Opsal M, Ózsvári L, Papadopoulos D, Papadopoulos T, Pelkonen S, Polak MP, Pozzato N, Rapaliuté E, Ribbens S, Niza-Ribeiro J, Roch FF, Rosenbaum Nielsen L, Saez JL, Nielsen SS, van Schaik G, Schwan E, Sekovska B, Starič J, Strain S, Šatran P, Šerić-Haračić S, Tamminen LM, Thulke HH, Toplak I, Tuunainen E, Verner S, Vilček Š, Yildiz R, Santman-Berends IMGA. Overview of Cattle Diseases Listed Under Category C, D or E in the Animal Health Law for Which Control Programmes Are in Place Within Europe. Front Vet Sci 2021; 8:688078. [PMID: 34395571 PMCID: PMC8361752 DOI: 10.3389/fvets.2021.688078] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 07/01/2021] [Indexed: 12/20/2022] Open
Abstract
The COST action “Standardising output-based surveillance to control non-regulated diseases of cattle in the European Union (SOUND control),” aims to harmonise the results of surveillance and control programmes (CPs) for selected cattle diseases to facilitate safe trade and improve overall control of cattle infectious diseases. In this paper we aimed to provide an overview on the diversity of control for these diseases in Europe. A selected cattle disease was defined as an infectious disease of cattle with no or limited control at EU level, which is not included in the European Union Animal health law Categories A or B under Commission Implementing Regulation (EU) 2020/2002. A CP was defined as surveillance and/or intervention strategies designed to lower the incidence, prevalence, mortality or prove freedom from a specific disease in a region or country. Passive surveillance, and active surveillance of breeding bulls under Council Directive 88/407/EEC were not considered as CPs. A questionnaire was designed to obtain country-specific information about CPs for each disease. Animal health experts from 33 European countries completed the questionnaire. Overall, there are 23 diseases for which a CP exists in one or more of the countries studied. The diseases for which CPs exist in the highest number of countries are enzootic bovine leukosis, bluetongue, infectious bovine rhinotracheitis, bovine viral diarrhoea and anthrax (CPs reported by between 16 and 31 countries). Every participating country has on average, 6 CPs (min–max: 1–13) in place. Most programmes are implemented at a national level (86%) and are applied to both dairy and non-dairy cattle (75%). Approximately one-third of the CPs are voluntary, and the funding structure is divided between government and private resources. Countries that have eradicated diseases like enzootic bovine leukosis, bluetongue, infectious bovine rhinotracheitis and bovine viral diarrhoea have implemented CPs for other diseases to further improve the health status of cattle in their country. The control of the selected cattle diseases is very heterogenous in Europe. Therefore, the standardising of the outputs of these programmes to enable comparison represents a challenge.
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Affiliation(s)
- Jaka Jakob Hodnik
- Clinic for Reproduction and Large Animals - Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Žaklin Acinger-Rogić
- Veterinary and Food Safety Directorate, Ministry of Agriculture, Zagreb, Croatia
| | - Mentor Alishani
- Department of Veterinary Medicine, Faculty of Agriculture and Veterinary, University of Prishtina "Hasan Prishtina", Prishtina, Albania
| | - Tiina Autio
- Finnish Food Authority, Veterinary Bacteriology and Pathology Unit, Kuopio, Finland
| | - Ana Balseiro
- Animal Health Department, University of León, León, Spain.,Animal Health Department, Instituto de Ganadería de Montaña Consejo Superior de Investigaciones Científicas-University of León, León, Spain
| | - John Berezowski
- Veterinary Public Health Institute, Vetsuisse, University of Bern, Bern, Switzerland
| | - Luís Pedro Carmo
- Veterinary Public Health Institute, Vetsuisse, University of Bern, Bern, Switzerland
| | - Ilias Chaligiannis
- School of Veterinary Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Beate Conrady
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.,Complexity Science Hub Vienna, Vienna, Austria
| | - Lina Costa
- Department of Agrarian and Veterinary Sciences, Agrarian School of Elvas, Polytechnic Institute of Portalegre, Portalegre, Portugal
| | - Iskra Cvetkovikj
- Faculty of Veterinary Medicine in Skopje, Ss Cyril and Methodius University in Skopje, Skopje, Macedonia
| | - Ivana Davidov
- Faculty of Agriculture, University of Novi Sad, Novi Sad, Serbia
| | | | - Igor Djadjovski
- Faculty of Veterinary Medicine in Skopje, Ss Cyril and Methodius University in Skopje, Skopje, Macedonia
| | - Elsa Leclerc Duarte
- Departamento de Medicina Veterinária, Mediterranean Institute for Agriculture, Environment and Development, Universidade de Évora, Évora, Portugal
| | | | | | - Jenny Frössling
- Department of Disease Control and Epidemiology, National Veterinary Institute (SVA), Uppsala, Sweden.,Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Skara, Sweden
| | - Anton Gerilovych
- National Scientific Centre, Institute for Experimental and Clinical Veterinary Medicine, Kharkiv, Ukraine
| | - Jörn Gethmann
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Epidemiology, Greifswald, Germany
| | - Jacinto Gomes
- Animal Health and Production Unit, National Institute for Agrarian and Veterinary Research, Oeiras, Portugal
| | - David Graham
- Animal Health Ireland, Carrick on Shannon, Ireland
| | | | - George J Gunn
- Epidemiology Research Unit, Department of Veterinary and Animal Science, Northern Faculty, Scotland's Rural College, Inverness, United Kingdom
| | - Madeleine K Henry
- Epidemiology Research Unit, Department of Veterinary and Animal Science, Northern Faculty, Scotland's Rural College, Inverness, United Kingdom
| | - Petter Hopp
- Section of Epidemiology, Norwegian Veterinary Institute (NVI), Oslo, Norway
| | - Hans Houe
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Elena Irimia
- Research and Development Institute for Bovine Balotesti, Balotesti, Romania
| | - Jožica Ježek
- Clinic for Reproduction and Large Animals - Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Ramon A Juste
- Department of Animal Health, NEIKER-Basque Institute for Agricultural Research and Development, Basque Research and Technology Alliance, Derio, Spain
| | - Emmanouil Kalaitzakis
- Clinic of Farm Animals, Veterinary Faculty, Aristotle University Thessaloniki, Thessaloniki, Greece
| | - Jasmeet Kaler
- School of Veterinary Medicine and Science, University of Nottingham, Nottingham, United Kingdom
| | - Selcuk Kaplan
- Department of Genetics, Faculty of Veterinary Medicine, Tekirdag Namik Kemal University, Tekirdag, Turkey
| | - Polychronis Kostoulas
- Laboratory of Epidemiology, Faculty of Public and One (Integrated) Health, School of Health Sciences, University of Thessaly, Karditsa, Greece
| | - Kaspars Kovalenko
- Faculty of Veterinary Medicine, Latvia University of Lifesciences and Technologies, Jelgava, Latvia
| | - Nada Kneževič
- Podravka Food Industry, Research and Development, Koprivnica, Croatia
| | - Tanja Knific
- Veterinary Faculty, Institute of Food Safety, Feed and Environment, University of Ljubljana, Ljubljana, Slovenia
| | - Xhelil Koleci
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Agricultural University of Tirana, Tirana, Albania
| | | | - Alvydas Malakauskas
- Department of Veterinary Pathobiology, Lithuanian University of Health Sciences, Veterinary Academy, Kaunas, Lithuania
| | - Rene Mandelik
- Department of Epizootiology, Parasitology and Protection of One Health, University of Veterinary Medicine and Pharmacy, Kosice, Slovakia
| | - Eleftherios Meletis
- Laboratory of Epidemiology, Faculty of Public and One (Integrated) Health, School of Health Sciences, University of Thessaly, Karditsa, Greece
| | - Madalina Mincu
- Research and Development Institute for Bovine Balotesti, Balotesti, Romania
| | - Kerli Mõtus
- Institute of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences, Tartu, Estonia
| | - Violeta Muñoz-Gómez
- Section of Epidemiology, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - Mihaela Niculae
- Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Cluj-Napoca, Romania
| | - Jelena Nikitović
- Institute for Genetic Resources, University of Banja Luka, Banja Luka, Bosnia and Herzegovina
| | - Matjaž Ocepek
- Veterinary Faculty, National Veterinary Institute, University of Ljubljana, Ljubljana, Slovenia
| | | | - László Ózsvári
- Department of Veterinary Forensics and Economics, University of Veterinary Medicine Budapest, Budapest, Hungary
| | - Dimitrios Papadopoulos
- Department of Microbiology, Faculty of Veterinary Medicine, Aristoteles University of Thessaloniki, Thessaloniki, Greece
| | - Theofilos Papadopoulos
- Department of Microbiology, Faculty of Veterinary Medicine, Aristoteles University of Thessaloniki, Thessaloniki, Greece
| | - Sinikka Pelkonen
- Finnish Food Authority, Veterinary Bacteriology and Pathology Unit, Kuopio, Finland
| | | | - Nicola Pozzato
- Laboratorio di Medicina Forense Veterinaria, Struttura Complessa Territoriale 1 - Verona e Vicenza, Istituto Zooprofilattico Sperimentale Delle Venezie, Vicenza, Italy
| | - Eglé Rapaliuté
- Department of Veterinary Pathobiology, Lithuanian University of Health Sciences, Veterinary Academy, Kaunas, Lithuania
| | | | - João Niza-Ribeiro
- Department of Population Studies, Institute of Biomedical Sciences Abel Salazar, University of Porto, Porto, Portugal
| | - Franz-Ferdinand Roch
- Unit of Food Microbiology, Institute for Food Safety, Food Technology and Veterinary Public Health, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Liza Rosenbaum Nielsen
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jose Luis Saez
- Ministry of Agriculture, Fisheries and Food, Madrid, Spain
| | - Søren Saxmose Nielsen
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Gerdien van Schaik
- Department of Population Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands.,Royal GD, Deventer, Netherlands
| | | | - Blagica Sekovska
- Faculty of Veterinary Medicine in Skopje, Ss Cyril and Methodius University in Skopje, Skopje, Macedonia
| | - Jože Starič
- Clinic for Reproduction and Large Animals - Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Sam Strain
- Animal Health and Welfare Northern Ireland, Dungannon, United Kingdom
| | - Petr Šatran
- State Veterinary Administration, Prague, Czechia
| | - Sabina Šerić-Haračić
- Animal Health Economics Department, Veterinary Faculty of the University of Sarajevo, Sarajevo, Bosnia and Herzegovina
| | | | - Hans-Hermann Thulke
- Department of Ecological Modelling, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
| | - Ivan Toplak
- Department of Virology, Veterinary Faculty, Institute of Microbiology and Parasitology, University of Ljubljana, Ljubljana, Slovenia
| | | | - Sharon Verner
- Animal Health and Welfare Northern Ireland, Dungannon, United Kingdom
| | - Štefan Vilček
- Department of Epizootiology, Parasitology and Protection of One Health, University of Veterinary Medicine and Pharmacy, Kosice, Slovakia
| | - Ramazan Yildiz
- Department of Internal Medicine, Faculty of Veterinary Medicine, Burdur Mehmet Akif Ersoy University, Burdur, Turkey
| | - Inge M G A Santman-Berends
- Department of Population Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands.,Royal GD, Deventer, Netherlands
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Toplak I, Hostnik P, Černe D, Mrkun J, Starič J. The Principles of the Voluntary Programme for the Control and Elimination of Bovine Viral Diarrhoea Virus (BVDV) From Infected Herds in Slovenia. Front Vet Sci 2021; 8:676473. [PMID: 34350227 PMCID: PMC8328193 DOI: 10.3389/fvets.2021.676473] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 06/18/2021] [Indexed: 11/13/2022] Open
Abstract
In Slovenia, the control of bovine viral diarrhoea virus (BVDV) infections started in 1994. Since 2014, a voluntary programme has been running according to the national rules that prescribe the conditions for recognising, acquiring, and maintaining a BVDV-free status for an individual herd. The principle is based on periodical laboratory testing and preventive measures that need to be strictly implemented in a herd. Between 2014 and 2020, a total of 348 herds were included in BVDV antibody testing, and 25.0% of tested herds were detected to be BVDV antibody positive. To recognise the BVDV-free status of the herd, the breeder should provide two consecutive tests with intervals of at least 6 months in all animals in the age from 7 to 13 months, with negative results for BVDV antibodies in ELISA. The BVDV-free status of the herd can be maintained by implementing preventive measures and can be renewed each year with one laboratory test in the age group of animals from 7 to 13 months for antibodies in ELISA. During the 7 years of the voluntary programme, 236 herds were included in the detection of BVDV in individual herds by real-time RT-PCR method and the elimination of positive animals from herds. In 71 (31.3%) herds, at least one BVDV-positive animal was detected, with the identification of a total of 267 persistently infected (PI) animals, representing an average of 2.9% of tested animals. The cost of testing for an average herd, recognised as BVDV-negative, and maintaining its BVDV-free status within the implemented voluntary programme, was €97.64/year, while for the average positive herd, the laboratory costs for elimination of BVDV were €189.59/year. Only limited progress towards eradication at the national level has been achieved in Slovenia since 2014.
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Affiliation(s)
- Ivan Toplak
- Institute for Microbiology and Parasitology-Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Peter Hostnik
- Institute for Microbiology and Parasitology-Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Danijela Černe
- Institute for Microbiology and Parasitology-Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Janko Mrkun
- Clinic for Reproduction and Large Animals-Clinic for Reproduction, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Jože Starič
- Clinic for Reproduction and Large Animals-Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
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Šimenc L, Knific T, Toplak I. The Comparison of Honeybee Viral Loads for Six Honeybee Viruses (ABPV, BQCV, CBPV, DWV, LSV3 and SBV) in Healthy and Clinically Affected Honeybees with TaqMan Quantitative Real-Time RT-PCR Assays. Viruses 2021; 13:v13071340. [PMID: 34372546 PMCID: PMC8310196 DOI: 10.3390/v13071340] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 07/05/2021] [Accepted: 07/07/2021] [Indexed: 01/17/2023] Open
Abstract
The viral loads of acute bee paralysis virus (ABPV), black queen cell virus (BQCV), chronic bee paralysis virus (CBPV), deformed wing virus (DWV), Lake Sinai virus 3 (LSV3), and sacbrood bee virus (SBV) were determined in samples with the use of quantitative TaqMan real-time reverse transcription and polymerase chain reaction (RT-qPCR). A total of 108 samples of healthy adult honeybees from four differently located apiaries and samples of honeybees showing different clinical signs of viral infections from 89 apiaries were collected throughout Slovenia. The aim of this study was to discover correlations between viral loads and clinical signs in adult honeybees and confirm previously set threshold viral load levels between healthy and clinically affected honeybees. Within this study, two new RT-qPCR assays for quantification of LSV3 and SBV were developed. Statistically significant differences in viral loads of positive samples were identified between healthy and clinically affected honeybees for ABPV, CBPV, DWV, and SBV, while for BQCV and LSV3, no statistical differences were observed between both groups. Despite high detected LSV3 prevalence and viral loads around 6.00 log10 viral copies/bee, this lineage probably has a limited impact on the health status of honeybee colonies. The determined viral loads between 3.94 log10 and 13.17 log10 in positive samples for six viruses, collected over 10 consecutive months, including winter, present additional information of high viral load variations in healthy honeybee colonies.
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Affiliation(s)
- Laura Šimenc
- Virology Unit, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1115 Ljubljana, Slovenia;
- Correspondence:
| | - Tanja Knific
- Institute of Food Safety, Feed and Environment, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1115 Ljubljana, Slovenia;
| | - Ivan Toplak
- Virology Unit, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1115 Ljubljana, Slovenia;
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Hodnik JJ, Knific T, Starič J, Toplak I, Ocepek M, Hostnik P, Ježek J. Overview of Slovenian Control Programmes for Cattle Diseases Not Regulated by the European Union. Front Vet Sci 2021; 8:674515. [PMID: 34307524 PMCID: PMC8299482 DOI: 10.3389/fvets.2021.674515] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 06/11/2021] [Indexed: 12/03/2022] Open
Abstract
The European Union (EU) regulates the control of cattle diseases listed in categories A and B of the European Animal Health Law (AHL). However, no strict mandatory EU regulation exists for the control of other cattle diseases that are listed in categories C, D and E. Slovenia has five control programmes (CPs) for the latter cattle diseases: bovine viral diarrhoea (BVD), infectious bovine rhinotracheitis (IBR), enzootic bovine leukosis (EBL), bluetongue and anthrax. Two (IBR and BVD) are voluntary and the others (EBL, anthrax and bluetongue) are compulsory. The three compulsory CPs are funded by the government. All the CPs are run by the government and laboratory tests are performed by the National Veterinary Institute. The rules for the CPs are laid down in Slovenian legislation. In addition, there is a national directive for the control of salmonellosis. Both BVD and IBR are endemic and have CPs based on increased biosecurity, testing and culling or vaccination, financed by the animal owners. Slovenia has been officially free of EBL since 2005 and carries out surveillance based on serological testing of a representative number of herds and inspection of carcasses at slaughter or necropsy. Vaccination is the main disease control measure for anthrax (sporadic) and bluetongue (currently perceived free—vaccination since 2017). Lack of motivation of farmers to participate in voluntary disease CPs and to implement and follow strict biosecurity measures are the most pressing issues in improving the health status of Slovenian cattle. An overview of the existing CPs and the circumstances leading to their implementation are presented.
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Affiliation(s)
- Jaka Jakob Hodnik
- Clinic for Reproduction and Large Animals-Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Tanja Knific
- Institute of Food Safety, Feed and Environment, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Jože Starič
- Clinic for Reproduction and Large Animals-Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Ivan Toplak
- Department of Virology, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Matjaž Ocepek
- National Veterinary Institute, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Peter Hostnik
- Department of Virology, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Jožica Ježek
- Clinic for Reproduction and Large Animals-Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
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Hostnik P, Černe D, Mrkun J, Starič J, Toplak I. Review of Infections With Bovine Herpesvirus 1 in Slovenia. Front Vet Sci 2021; 8:676549. [PMID: 34277755 PMCID: PMC8281293 DOI: 10.3389/fvets.2021.676549] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 06/08/2021] [Indexed: 01/02/2023] Open
Abstract
In the 1950s, infectious bovine rhinotracheitis/infectious pustular vulvovaginitis (IBR/IPV) disease was clinically detected and documented in cattle for the first time in Slovenia. The bovine herpes virus 1 (BoHV-1) was confirmed several times from infected herds by virus isolation on cell cultures. To keep the IC virus-free, high biosecurity measures were introduced. Before entering the IC, all calves are serologically tested and quarantined. Bulls in Slovenian insemination centres (IC) have been negative for IBR /IPV infection since 1979. From 1985 to 1991, few large-scale studies of the prevalence of IBR/IPV were carried out. In 1985, a high percentage (56.9%) of serologically positive animals were found in large state farms with Holstein Friesian cattle. Epidemiological studies in farm with bulls' mother herds were also carried out in the farms with Simmental and Brown cows. Antibodies against BoHV-1 were detected in the serum of 2.3% of Brown cattle and 3.5% of Simmental cattle. In the year 2000, 3.4% of bulk tank milk samples from 13,349 dairy farms were detected BoHV-1 antibodies positive. The highest percentage of positive animals was found in regions with an intensive grazing system (6.2% positive) and the lowest percentage in the east part of Slovenia (0.9% positive) on farms with mostly Simmental cattle. In 2006, a total 204,662 sera of cattle older than 24 months were tested for the presence of BoHV-1 antibodies and positive cattle were detected in 3.6% of tested farms. These farms kept 34,537 animals that were potential carriers of the BoHV-1. Most of the positive farms kept Holstein Friesian cattle, descendants from the state-owned farms, which were privatised or closed after 1990. In 2015, the Administration of the Republic of Slovenia for Food Safety, Veterinary and Plant Protection issued a rule that describes the conditions for granting and maintaining the status of BoHV-1 free holdings. The rule provides a voluntary control programme for breeders who want to obtain BoHV-1 free status and are willing to cover all the cost of acquiring and maintaining that status. There has been very little response from breeders.
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Affiliation(s)
- Peter Hostnik
- Institute for Microbiology and Parasitology-Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Danijela Černe
- Institute for Microbiology and Parasitology-Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Janko Mrkun
- Clinic for Reproduction and Large Animals-Clinic for Reproduction, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Jože Starič
- Clinic for Reproduction and Large Animals-Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Ivan Toplak
- Institute for Microbiology and Parasitology-Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
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Jevšnik Virant M, Černe D, Petrovec M, Paller T, Toplak I. Genetic Characterisation and Comparison of Three Human Coronaviruses (HKU1, OC43, 229E) from Patients and Bovine Coronavirus (BCoV) from Cattle with Respiratory Disease in Slovenia. Viruses 2021; 13:v13040676. [PMID: 33920821 PMCID: PMC8071153 DOI: 10.3390/v13040676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 04/10/2021] [Accepted: 04/12/2021] [Indexed: 11/16/2022] Open
Abstract
Coronaviruses (CoV) are widely distributed pathogens of human and animals and can cause mild or severe respiratory and gastrointestinal disease. Antigenic and genetic similarity of some CoVs within the Betacoronavirus genus is evident. Therefore, for the first time in Slovenia, we investigated the genetic diversity of partial 390-nucleotides of RNA-dependent-RNA polymerase gene (RdRp) for 66 human (HCoV) and 24 bovine CoV (BCoV) positive samples, collected between 2010 and 2016 from human patients and cattle with respiratory disease. The characterized CoV strains belong to four different clusters, in three separate human clusters HCoV-HKU1 (n = 34), HCoV-OC43 (n = 31) and HCoV 229E (n = 1) and bovine grouping only as BCoVs (n = 24). BCoVs from cattle and HCoV-OC43 were genetically the most closely related and share 96.4-97.1% nucleotide and 96.9-98.5% amino acid identity.
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Affiliation(s)
- Monika Jevšnik Virant
- Institute of Microbiology and Immunology, Faculty of Medicine, University of Ljubljana, Zaloška 4, 1000 Ljubljana, Slovenia; (M.J.V.); (M.P.)
| | - Danijela Černe
- Virology Unit, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1115 Ljubljana, Slovenia;
| | - Miroslav Petrovec
- Institute of Microbiology and Immunology, Faculty of Medicine, University of Ljubljana, Zaloška 4, 1000 Ljubljana, Slovenia; (M.J.V.); (M.P.)
| | - Tomislav Paller
- National Veterinary Institute, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1115 Ljubljana, Slovenia;
| | - Ivan Toplak
- Virology Unit, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1115 Ljubljana, Slovenia;
- Correspondence:
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Černe D, Hostnik P, Toplak I. The Successful Elimination of Sylvatic Rabies Using Oral Vaccination of Foxes in Slovenia. Viruses 2021; 13:405. [PMID: 33806582 PMCID: PMC8001208 DOI: 10.3390/v13030405] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/24/2021] [Accepted: 02/26/2021] [Indexed: 01/21/2023] Open
Abstract
Sylvatic rabies was present in Slovenia between 1973 and 2013, with the red fox as the main reservoir of the rabies virus. The first oral rabies vaccination (ORV) control program in foxes started in 1988, using the manual distribution of baits. Significant improvement of fox vaccination was achieved with the aerial distribution of baits, starting in 1995 and successfully finished with the final, fifty-ninth vaccination campaign in 2019. Between 1979 and 2019, a total of 86,471 samples were tested, and 10,975 (12.69%) rabies-positive animals were identified. Within the ORV, two different vaccines were used, containing modified live virus strain Street Alabama Dufferin (SAD) B19 and SAD Bern, while the last ORV campaigns were completed in 2019, with a vaccine containing a genetically modified strain of SPBN GASGAS. Molecular epidemiological studies of 95 rabies-positive samples, originating from red foxes, badgers, cattle, dogs, martens, cats, and horses, revealed a low genetic diversity of circulating strains and high similarity to strains from neighboring countries. During the elimination program, few vaccine-induced rabies cases were detected: three in red foxes and one case in a marten, with no epidemiological relevance. Slovenia has been officially declared a country free of rabies since 2016.
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Affiliation(s)
- Danijela Černe
- Institute of Microbiology and Parasitology, Virology Unit, Veterinary Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia; (P.H.); (I.T.)
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Šimenc L, Kuhar U, Jamnikar-Ciglenečki U, Toplak I. First Complete Genome of Lake Sinai Virus Lineage 3 and Genetic Diversity of Lake Sinai Virus Strains From Honey Bees and Bumble Bees. J Econ Entomol 2020; 113:1055-1061. [PMID: 32207825 DOI: 10.1093/jee/toaa049] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Indexed: 06/10/2023]
Abstract
The complete genome of Lake Sinai virus 3 (LSV3) was sequenced by the Ion Torrent next-generation sequencing (NGS) technology from an archive sample of honey bees collected in 2010. This strain M92/2010 is the first complete genome sequence of LSV lineage 3. From October 2016 to December 2017, 56 honey bee samples from 32 different locations and 41 bumble bee samples from five different locations were collected. These samples were tested using a specific reverse transcriptase-polymerase chain reaction (RT-PCR) method; 75.92% of honey bee samples and 17.07% of bumble bee samples were LSV-positive with the RT-PCR method. Phylogenetic comparison of 557-base pair-long RNA-dependent RNA polymerase (RdRp) genome region of selected 23 positive samples of honey bees and three positive bumble bee samples identified three different LSV lineages: LSV1, LSV2, and LSV3. The LSV3 lineage was confirmed for the first time in Slovenia in 2010, and the same strain was later detected in several locations within the country. The LSV strains detected in bumble bees are from 98.6 to 99.4% identical to LSV strains detected among honey bees in the same territory.
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Affiliation(s)
- Laura Šimenc
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva, Ljubljana, Slovenia
| | - Urška Kuhar
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva, Ljubljana, Slovenia
| | - Urška Jamnikar-Ciglenečki
- Institute of Food Safety, Feed and Environment, Veterinary Faculty, University of Ljubljana, Gerbičeva, Ljubljana, Slovenia
| | - Ivan Toplak
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva, Ljubljana, Slovenia
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Vengušt G, Žele Vengušt D, Toplak I, Rihtarič D, Kuhar U. Post-epidemic investigation of Schmallenberg virus in wild ruminants in Slovenia. Transbound Emerg Dis 2020; 67:1708-1715. [PMID: 31991522 PMCID: PMC7383813 DOI: 10.1111/tbed.13495] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 11/08/2019] [Accepted: 01/22/2020] [Indexed: 11/29/2022]
Abstract
Schmallenberg virus (SBV) is a vector-borne virus belonging to the genus Orthobunyavirus within the Bunyaviridae family. SBV emerged in Europe in 2011 and was characterized by epidemics of abortions, stillbirths and congenital malformations in domestic ruminants. The first evidence of SBV infection in Slovenia was from an ELISA-positive sample from a cow collected in August 2012; clinical manifestations of SBV disease in sheep and cattle were observed in 2013, with SBV RNA detected in samples collected from a total of 28 herds. A potential re-emergence of SBV in Europe is predicted to occur when population-level immunity declines. SBV is also capable of infecting several wild ruminant species, although clinical disease has not yet been described in these species. Data on SBV-positive wild ruminants suggest that these species might be possible sources for the re-emergence of SBV. The aim of this study was to investigate whether SBV was circulating among wild ruminants in Slovenia and whether these species can act as a virus reservoir. A total of 281 blood and spleen samples from wild ruminants, including roe deer, red deer, chamois and European mouflon, were collected during the 2017-2018 hunting season. Serum samples were tested for antibodies against SBV by ELISA; the overall seroprevalence was 18.1%. Seropositive samples were reported from all over the country in examined animal species from 1 to 15 years of age. Spleen samples from the seropositive animals and serum samples from the seronegative animals were tested for the presence of SBV RNA using real-time RT-PCR; all the samples tested negative. Based on the results of the seropositive animals, it was demonstrated that SBV was circulating in wild ruminant populations in Slovenia even after the epidemic, as almost half (23/51) of the seropositive animals were 1 or 2 years old.
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Affiliation(s)
- Gorazd Vengušt
- Institute of Pathology, Wild Animals, Fish and Bees, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Diana Žele Vengušt
- Institute of Pathology, Wild Animals, Fish and Bees, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Ivan Toplak
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Danijela Rihtarič
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Urška Kuhar
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
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Jamnikar-Ciglenecki U, Pislak Ocepek M, Toplak I. Genetic Diversity of Deformed Wing Virus From Apis mellifera carnica (Hymenoptera: Apidae) and Varroa Mite (Mesostigmata: Varroidae). J Econ Entomol 2019; 112:11-19. [PMID: 30285237 DOI: 10.1093/jee/toy312] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Indexed: 06/08/2023]
Abstract
Deformed wing virus (DWV) is one of the most widespread viruses that infect honey bee colonies. The route of infection is directly through contaminated food, feces, and air, or indirectly through the varroa mite, which acts as a vector. Positive DWV samples were obtained from Carniolan honey bee (Apis mellifera carnica) colonies and of varroa mites from the whole territory of Slovenia during a survey between 2007 and 2014. Nucleotide sequences of 471 nucleotides for the L protein gene and 573 nucleotides for the helicase gene were compared. High genetic diversity was observed among these Slovenian Carniolan honey bee DWV field samples, as well as with almost all the strains previously found in other countries in Europe. Phylogenetic analyses in two regions of the viral genome show that several of the DWV strains obtained from honey bees and varroa are genetically very closely related, confirming the important role of varroa in the transmission of DWV. Identification of closely related sequences also confirmed that the same strains of DWV have been successfully transmitted between various honey bee colonies and apiaries. It has also been established that simultaneous infection, in one apiary, of honey bees with two or more different strains of DWV is quite frequent. This is phylogenetic study that compares honey bee and varroa DWV strains from Carniolan honeybees.
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Affiliation(s)
- Urska Jamnikar-Ciglenecki
- Institute of Food safety, Feed and Environment, Veterinary faculty, University of Ljubljana, Gerbiceva, Ljubljana, Slovenia
| | - Metka Pislak Ocepek
- Institute of Pathology, Wild Animals, Fish and Bees, Veterinary faculty, University of Ljubljana, Gerbiceva, Ljubljana, Slovenia
| | - Ivan Toplak
- Institute of Microbiology and Parasitology, Veterinary faculty, University of Ljubljana, Gerbiceva, Ljubljana, Slovenia
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16
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Vilibic-Cavlek T, Savic V, Petrovic T, Toplak I, Barbic L, Petric D, Tabain I, Hrnjakovic-Cvjetkovic I, Bogdanic M, Klobucar A, Mrzljak A, Stevanovic V, Dinjar-Kujundzic P, Radmanic L, Monaco F, Listes E, Savini G. Emerging Trends in the Epidemiology of West Nile and Usutu Virus Infections in Southern Europe. Front Vet Sci 2019; 6:437. [PMID: 31867347 PMCID: PMC6908483 DOI: 10.3389/fvets.2019.00437] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Accepted: 11/19/2019] [Indexed: 02/05/2023] Open
Abstract
The epidemiology of West Nile (WNV) and Usutu virus (USUV) has changed dramatically over the past two decades. Since 1999, there have been regular reports of WNV outbreaks and the virus has expanded its area of circulation in many Southern European countries. After emerging in Italy in 1996, USUV has spread to other countries causing mortality in several bird species. In 2009, USUV seroconversion in horses was reported in Italy. Co-circulation of both viruses was detected in humans, horses and birds. The main vector of WNV and USUV in Europe is Culex pipiens, however, both viruses were found in native Culex mosquito species (Cx. modestus, Cx. perexiguus). Experimental competence to transmit the WNV was also proven for native and invasive mosquitoes of Aedes and Culex genera (Ae. albopictus, Ae. detritus, Cx. torrentium). Recently, Ae. albopictus and Ae. japonicus naturally-infected with USUV were reported. While neuroinvasive human WNV infections are well-documented, USUV infections are sporadically detected. However, there is increasing evidence of a role of USUV in human disease. Seroepidemiological studies showed that USUV circulation is more common than WNV in some endemic regions. Recent data showed that WNV strains detected in humans, horses, birds, and mosquitoes mainly belong to lineage 2. In addition to European USUV lineages, some reports indicate the presence of African USUV lineages as well. The trends in WNV/USUV range and vector expansion are likely to continue in future years. This mini-review provides an update on the epidemiology of WNV and USUV infections in Southern Europe within a multidisciplinary "One Health" context.
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Affiliation(s)
- Tatjana Vilibic-Cavlek
- Department of Virology, Croatian Institute of Public Health, Zagreb, Croatia
- School of Medicine, University of Zagreb, Zagreb, Croatia
- *Correspondence: Tatjana Vilibic-Cavlek
| | - Vladimir Savic
- Poultry Center, Croatian Veterinary Institute, Zagreb, Croatia
| | - Tamas Petrovic
- Department for Virology, Scientific Veterinary Institute, Novi Sad, Serbia
| | - Ivan Toplak
- Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Ljubo Barbic
- Department of Microbiology and Infectious Diseases With Clinic, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia
| | - Dusan Petric
- Laboratory for Medical and Veterinary Entomology, Faculty of Agriculture, University of Novi Sad, Novi Sad, Serbia
| | - Irena Tabain
- Department of Virology, Croatian Institute of Public Health, Zagreb, Croatia
| | - Ivana Hrnjakovic-Cvjetkovic
- Center for Microbiology, Institute of Public Health Vojvodina, Novi Sad, Serbia
- Medical Faculty, University of Novi Sad, Novi Sad, Serbia
| | - Maja Bogdanic
- Department of Virology, Croatian Institute of Public Health, Zagreb, Croatia
| | - Ana Klobucar
- Division of Disinfection, Disinfestation and Pest Control, Andrija Stampar Teaching Institute of Public Health, Zagreb, Croatia
| | - Anna Mrzljak
- School of Medicine, University of Zagreb, Zagreb, Croatia
- Department of Medicine, Merkur University Hospital, Zagreb, Croatia
| | - Vladimir Stevanovic
- Department of Microbiology and Infectious Diseases With Clinic, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia
| | | | - Luka Radmanic
- Department of Microbiology and Infectious Diseases With Clinic, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia
| | - Federica Monaco
- OIE Reference Center for West Nile Disease, Istituto Zooprofilattico Sperimentale “G. Caporale”, Teramo, Italy
| | - Eddy Listes
- Laboratory for Diagnostics, Croatian Veterinary Institute, Regional Institute Split, Split, Croatia
| | - Giovanni Savini
- OIE Reference Center for West Nile Disease, Istituto Zooprofilattico Sperimentale “G. Caporale”, Teramo, Italy
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Muth D, Corman VM, Roth H, Binger T, Dijkman R, Gottula LT, Gloza-Rausch F, Balboni A, Battilani M, Rihtarič D, Toplak I, Ameneiros RS, Pfeifer A, Thiel V, Drexler JF, Müller MA, Drosten C. Attenuation of replication by a 29 nucleotide deletion in SARS-coronavirus acquired during the early stages of human-to-human transmission. Sci Rep 2018; 8:15177. [PMID: 30310104 PMCID: PMC6181990 DOI: 10.1038/s41598-018-33487-8] [Citation(s) in RCA: 145] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 09/27/2018] [Indexed: 12/03/2022] Open
Abstract
A 29 nucleotide deletion in open reading frame 8 (ORF8) is the most obvious genetic change in severe acute respiratory syndrome coronavirus (SARS-CoV) during its emergence in humans. In spite of intense study, it remains unclear whether the deletion actually reflects adaptation to humans. Here we engineered full, partially deleted (-29 nt), and fully deleted ORF8 into a SARS-CoV infectious cDNA clone, strain Frankfurt-1. Replication of the resulting viruses was compared in primate cell cultures as well as Rhinolophus bat cells made permissive for SARS-CoV replication by lentiviral transduction of the human angiotensin-converting enzyme 2 receptor. Cells from cotton rat, goat, and sheep provided control scenarios that represent host systems in which SARS-CoV is neither endemic nor epidemic. Independent of the cell system, the truncation of ORF8 (29 nt deletion) decreased replication up to 23-fold. The effect was independent of the type I interferon response. The 29 nt deletion in SARS-CoV is a deleterious mutation acquired along the initial human-to-human transmission chain. The resulting loss of fitness may be due to a founder effect, which has rarely been documented in processes of viral emergence. These results have important implications for the retrospective assessment of the threat posed by SARS.
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Affiliation(s)
- Doreen Muth
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Virology, Charitéplatz 1, 10117, Berlin, Germany
- German Center for Infection Research (DZIF), Berlin, Germany
- Institute of Virology, University of Bonn Medical Centre, Sigmund-Freud-Str. 25, 53127, Bonn, Germany
| | - Victor Max Corman
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Virology, Charitéplatz 1, 10117, Berlin, Germany
- German Center for Infection Research (DZIF), Berlin, Germany
- Institute of Virology, University of Bonn Medical Centre, Sigmund-Freud-Str. 25, 53127, Bonn, Germany
| | - Hanna Roth
- Institute of Virology, University of Bonn Medical Centre, Sigmund-Freud-Str. 25, 53127, Bonn, Germany
| | - Tabea Binger
- Institute of Virology, University of Bonn Medical Centre, Sigmund-Freud-Str. 25, 53127, Bonn, Germany
| | - Ronald Dijkman
- Federal Department of Home Affairs, Institute of Virology and Immunology IVI, Bern and Mittelhäusern, Sensemattstrasse 293, 3147, Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012, Bern, Switzerland
| | - Lina Theresa Gottula
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Virology, Charitéplatz 1, 10117, Berlin, Germany
- German Center for Infection Research (DZIF), Berlin, Germany
- Institute of Virology, University of Bonn Medical Centre, Sigmund-Freud-Str. 25, 53127, Bonn, Germany
| | - Florian Gloza-Rausch
- Noctalis, Centre for Bat Protection and Information, Oberbergstraße 27, 23795, Bad Segeberg, Germany
| | - Andrea Balboni
- Dipartimento di Scienze Mediche Veterinarie, Facoltà di Medicina Veterinaria, Alma Mater Studiorum-Università di Bologna, Via Tolara di Sopra 50, 40064, Ozzano Emilia, (BO), Italy
| | - Mara Battilani
- Dipartimento di Scienze Mediche Veterinarie, Facoltà di Medicina Veterinaria, Alma Mater Studiorum-Università di Bologna, Via Tolara di Sopra 50, 40064, Ozzano Emilia, (BO), Italy
| | - Danijela Rihtarič
- Virology Unit, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000, Ljubljana, Slovenia
| | - Ivan Toplak
- Virology Unit, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000, Ljubljana, Slovenia
| | - Ramón Seage Ameneiros
- Institute of Evolutionary Ecology and Conservation Genomics, University of Ulm, Albert-Einstein Allee 11, 89069, Ulm, Germany
- Group Morcegos de Galicia, Drosera Society, Pdo. Magdalena, G-2, 2° esq, 15320, As Pontes, Spain
| | - Alexander Pfeifer
- Institute for Pharmacology and Toxicology, University of Bonn, Sigmund-Freud-Str. 25, 53127, Bonn, Germany
| | - Volker Thiel
- Federal Department of Home Affairs, Institute of Virology and Immunology IVI, Bern and Mittelhäusern, Sensemattstrasse 293, 3147, Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012, Bern, Switzerland
| | - Jan Felix Drexler
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Virology, Charitéplatz 1, 10117, Berlin, Germany
- German Center for Infection Research (DZIF), Berlin, Germany
- Institute of Virology, University of Bonn Medical Centre, Sigmund-Freud-Str. 25, 53127, Bonn, Germany
| | - Marcel Alexander Müller
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Virology, Charitéplatz 1, 10117, Berlin, Germany
- German Center for Infection Research (DZIF), Berlin, Germany
- Institute of Virology, University of Bonn Medical Centre, Sigmund-Freud-Str. 25, 53127, Bonn, Germany
| | - Christian Drosten
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Virology, Charitéplatz 1, 10117, Berlin, Germany.
- German Center for Infection Research (DZIF), Berlin, Germany.
- Institute of Virology, University of Bonn Medical Centre, Sigmund-Freud-Str. 25, 53127, Bonn, Germany.
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18
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Plut J, Toplak I, Štukelj M. Variations in the detection of anti-PEDV antibodies in serum samples using three diagnostic tests - short communication. Acta Vet Hung 2018; 66:337-342. [PMID: 29958519 DOI: 10.1556/004.2018.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Over the last few years several porcine epidemic diarrhoea (PED) outbreaks have been discovered in Europe including the first PED case in Slovenia in January 2015. The aim of this study was to determine when PED virus (PEDV) infection started in Slovenia. Serum samples collected between 2012 and 2016 were tested. Three hundred and seventy-five serum samples were collected from 132 Slovenian small, one-site pig farms. Samples were tested for PEDV antibodies utilising three different serological methods: commercially-available indirect ELISA, in-house blocking ELISA test and Immunoperoxidase Monolayer Assay (IPMA) test. One hundred and seventy (45.33%) tested samples were found positive by the commercially-available ELISA test kit, and 10 (5.68%) of these 170 samples found positive were positive by the in-house blocking ELISA. Only these 10 samples were collected from a farm where clinical signs of PED infection had been observed and PEDV was confirmed by RT-PCR methodology; the other 160 samples were collected randomly. Thirty-two samples with the highest S/P value obtained with the commercial ELISA were all negative with IPMA. Reasons for the high variance in the results obtained remain unclear; more research is required to ensure higher sensitivity and specificity in terms of PEDV antibody tests and other PED diagnostic methods.
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Affiliation(s)
- Jan Plut
- 1 Clinic for Ruminants and Pigs, Clinic for Reproduction and Farm Animals, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Ivan Toplak
- 2 Department of Virology, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Marina Štukelj
- 1 Clinic for Ruminants and Pigs, Clinic for Reproduction and Farm Animals, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
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19
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Abstract
A survey was conducted to evaluate the presence and prevalence of Porcine Bocavirus (PBoV) in Croatian domestic pigs by means of PCR targeting the NS1 gene fragment of PBoV. This study included testing of faecal samples collected from 10 small commercial farms and 11 small backyard holdings in Croatia. The presence of PBoV was confirmed by PCR in 24 out of 57 composite faecal samples from small commercial farms and in 12 out of 43 composite faecal samples from small backyard holdings. The PCR products of 18 positive samples were sequenced for genotyping. PBoV sequences grouped into the PBoV-a, PBoV-b and PBoV-c groups with 90.81% to 99.25% nucleotide identity. All Croatian PBoV sequences showed a high nucleotide and amino acid identity with PBoV sequences from China and Hong Kong, the United States, Sweden, and Slovenia. These results clearly show that PBoV is circulating among the domestic pig population in Croatia.
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Affiliation(s)
- Tomislav Keros
- 1 Department of Virology, Croatian Veterinary Institute, Savska cesta 143, HR-10 000 Zagreb, Croatia
| | - Lorena Jemeršić
- 1 Department of Virology, Croatian Veterinary Institute, Savska cesta 143, HR-10 000 Zagreb, Croatia
| | - Ivan Toplak
- 2 Institute of Microbiology and Parasitology, Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Jelena Prpić
- 1 Department of Virology, Croatian Veterinary Institute, Savska cesta 143, HR-10 000 Zagreb, Croatia
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20
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Raspor Lainšček P, Toplak I, Kirbiš A. A comprehensive study of hepatitis E virus infection in pigs entering a slaughterhouse in Slovenia. Vet Microbiol 2017; 212:52-58. [PMID: 29173588 DOI: 10.1016/j.vetmic.2017.11.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 11/04/2017] [Accepted: 11/05/2017] [Indexed: 12/17/2022]
Abstract
Hepatitis E is a zoonotic viral disease of pigs with increasing public health concern in industrialized countries. Presented broad study of hepatitis E virus (HEV) presence in pigs in Slovenia is the first attempt to overview the HEV situation in pigs entering a slaughterhouse and, further, to analyse the possibility of HEV entering into the food supply chain. 2433 samples from 811 clinically healthy pigs were collected at four slaughterhouses in Slovenia. Sampling covered three different age groups of pigs and three different types of samples (faeces, bile and liver) important for tracing HEV in a pig population. In addition, 63 swab samples were collected systematically from three different sites on the slaughter line, as well as 22 samples of minced meat and 30 bratwurst samples. All the samples were screened for the presence of HEV nucleic acids by specific real-time RT-PCR assay. In the group of three month old pigs 13.7% of faeces, 13.0% of bile and 2.1% of liver samples were HEV positive. In the group of six months old pigs only 0.25% of liver and 0.25% of bile samples were positive. In the category of sows, no positive samples were found. Two out of 63 swab samples collected on the slaughter line were HEV positive. All tested samples of minced meat and bratwurst were negative. The phylogenetic analysis of 50 HEV positive samples, with comparison of 366 nucleotides in ORF1 region, revealed high diversity of identified strains of HEV in pigs, belonging into subtypes 3a, 3b, 3c and 3e.
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Affiliation(s)
- Petra Raspor Lainšček
- Institute for Food Safety, Feed and Environment, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia.
| | - Ivan Toplak
- Institute for Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Andrej Kirbiš
- Institute for Food Safety, Feed and Environment, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
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21
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Štukelj M, Plut J, Toplak I. Serum inoculation as a possibility for elimination of porcine reproductive and respiratory syndrome (PRRS) from a farrow-to-finish pig farm. Acta Vet Hung 2015; 63:389-99. [PMID: 26551429 DOI: 10.1556/004.2015.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The large heterogeneity among porcine reproductive and respiratory syndrome virus (PRRSV) isolates is probably the main obstacle to its effective control using current commercial vaccines. Intentionally exposing all breeding pigs to PRRSV circulating on the farm could eliminate porcine reproductive and respiratory syndrome (PRRS) from the herd. The objective of this study was to eliminate PRRS from a farrow-to-finish pig farm by serum inoculation. The owner was acquainted with the strict biosecurity measures. Breeding pigs were immunised with serum, which was obtained from PRRSV-positive weaners from the same farm. The percent of antibody high positive breeding pigs decreased six months after serum inoculation, while 34 months after serum inoculation no more antibody high positive pigs were detected and 56.8% of breeding pigs and all other categories were free of antibodies. In the breeding herd no virus was detected during all testing while PRRSV circulated in 2-month-old weaners until 12 months after serum inoculation. Later all tested samples from weaners, growers and fatteners were negative. Herd closure and the adoption of strict biosecurity measures are essential. Serum inoculation of the breeding herd proved to be a successful measure for eliminating PRRS from this farrow-to-finish farm.
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Affiliation(s)
- Marina Štukelj
- 1Institute for the Health Care of Pigs, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Jan Plut
- 1Institute for the Health Care of Pigs, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Ivan Toplak
- 2Institute for Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
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Henigman U, Biasizzo M, Vadnjal S, Toplak I, Gombač M, Steyer A, Poljšak Prijatelj M, Ambrožič M, Fonda I, Kirbiš A, Barlič-Maganja D. Molecular characterisation of noroviruses detected in mussels (Mytilus galloprovincialis) from harvesting areas in Slovenia. New Microbiol 2015; 38:225-233. [PMID: 25938747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 05/27/2015] [Indexed: 06/04/2023]
Abstract
Noroviruses are a leading cause of viral gastroenteritis in humans and are responsible for many outbreaks worldwide. Mussels are one of the most important foodstuffs connected with norovirus outbreaks, also resulting in multinational dimensions. Two hundred and thirty-eight (238) samples of mussels (Mytilus galloprovincialis) were collected in periods between the years 2006-2008 and 2010-2012 to study the prevalence of noroviruses (NoVs) from harvesting areas along the Adriatic coast of Slovenia. Between 2006 and 2008, 9.1% to 24.6% of mussel samples tested by specific GI and/or GII real-time RT-PCR methods were found to be positive for NoVs while between 2010 and 2012 the percentage of NoV positive samples varied from 12.5% to 22.2%. At the nucleotide level within the RdRp gene fragment the genetic diversity of NoVs detected in mussels ranged between 78.8-81.0% nucleotide identity among GII strains (92.1-99.6% within the GII.P4 genotype), 100% nucleotide identity among GI and 58.4-60.2% among GI and GII strains. Nine of the NoV strains detected from mussels were genotyped as GII.4, while two samples were within GI.P2 and one was a positive sample within genotype GII.P21. This study confirmed that mussels are a potential source of the NoV infection. The detected NoVs share the same topology on the phylogenetic tree within the NoV strains detected in water samples and human patients, not only from Slovenia but also from many different countries worldwide. We can assume that mussels in harvesting areas are not only contaminated from the surrounding area but also by contaminated water and sewage from large transport ships, which are regularly present in the area.
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Affiliation(s)
- Urška Henigman
- Institute for Food Hygiene, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Majda Biasizzo
- Institute for Food Hygiene, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Stanka Vadnjal
- Institute for Food Hygiene, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Ivan Toplak
- Institute for Microbiology and Parasitology, Virology Unit, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Mitja Gombač
- Institute of Pathology, Forensic and Administrative Veterinary Medicine, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Andrej Steyer
- Institute of Microbiology and Immunology, Faculty of Medicine, University of Ljubljana, Zaloška 4, 1000 Ljubljana, Slovenia
| | - Mateja Poljšak Prijatelj
- Institute of Microbiology and Immunology, Faculty of Medicine, University of Ljubljana, Zaloška 4, 1000 Ljubljana, Slovenia
| | - Mateja Ambrožič
- Food Science and Technology Department, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, Ljubljana, Slovenia
| | - Irena Fonda
- Fonda.si d.o.o. Fonda s. r. l., Liminijanska cesta 117, Portorož, Slovenia
| | - Andrej Kirbiš
- Institute for Food Hygiene, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Darja Barlič-Maganja
- Faculty of Health Sciences, University of Primorska, Polje 42, 6310 Izola, Slovenia
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Kuhar U, Završnik J, Toplak I, Malovrh T. Detection and molecular characterisation of equine infectious anaemia virus from field outbreaks in Slovenia. Equine Vet J 2013; 46:386-91. [DOI: 10.1111/evj.12138] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- U. Kuhar
- Veterinary Faculty; Institute for Microbiology and Parasitology; Virology Unit; University of Ljubljana; Slovenia
| | - J. Završnik
- Veterinary Faculty; Institute for Microbiology and Parasitology; Virology Unit; University of Ljubljana; Slovenia
| | - I. Toplak
- Veterinary Faculty; Institute for Microbiology and Parasitology; Virology Unit; University of Ljubljana; Slovenia
| | - T. Malovrh
- Veterinary Faculty; Institute for Microbiology and Parasitology; Virology Unit; University of Ljubljana; Slovenia
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Abstract
The genetic diversity of acute bee paralysis virus (ABPV) in honeybees was studied in Slovenia. A total of 248 honeybee samples obtained from 134 different apiaries in Slovenia were tested for the presence of ABPV by RT-PCR. Specific 398-base pair (bp) products were generated with primers amplifying the ORF2 region and 452-base pair (bp) products with primers amplifying the ORF1 region of the viral genome. To characterise the overall nucleotide diversity among the ABPV sequences, phylogenetic trees with 54 and 29 samples were constructed from 357 nucleotides from ORF2 and 408 nucleotides from ORF1, respectively. The nucleotide comparison of Slovenian ABPV strains revealed two distinct clusters in ORF2 and ORF1, showing 91.2-92.5% and 96.7-97.2% nucleotide identity, respectively. Comparison of data regarding the geographical location of the ABPV-positive samples with the constructed phylogenetic trees revealed the random distribution of the two clusters throughout Slovenia.
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Affiliation(s)
- Urška Jamnikar Ciglenečki
- 1 University of Ljubljana Institute of Microbiology and Parasitology, Veterinary Faculty Gerbičeva 60 SI-1115 Ljubljana Slovenia
| | - Ivan Toplak
- 1 University of Ljubljana Institute of Microbiology and Parasitology, Veterinary Faculty Gerbičeva 60 SI-1115 Ljubljana Slovenia
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Toplak I, Lazić S, Lupulović D, Prodanov-Radulović J, Becskei Z, Došen R, Petrović T. Study of the genetic variability of porcine circovirus type 2 detected in Serbia and Slovenia. Acta Vet Hung 2012; 60:409-20. [PMID: 22903085 DOI: 10.1556/avet.2012.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Recent variants of porcine circovirus type 2 (PCV2) were obtained from tissues of domestic pigs with porcine circovirus associated disease and from randomly selected wild boar samples from Serbia and Slovenia. A 450-base-pair nucleotide sequence was obtained by PCR from the ORF2. The derived nucleotide and amino acid sequences were aligned and compared to the corresponding region of closely related PCV2 sequences determined in previous years and retrieved from the GenBank. The 30 Serbian and 17 Slovenian PCV2 sequences clustered into three previously determined genotypes (PCV2a: 7), (PCV2b: 38) and (PCV2d: 2). Three major variable regions, concerning 29 amino acid position substitutions within the ORF2, were observed, which further supports the segregation of the detected strains into three separate genotypes. This study indicates that PCV2b is the predominant genotype in Serbia and Slovenia and the detected PCV2 strains are closely related to those previously described in Europe and in other parts of the world.
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Affiliation(s)
- Ivan Toplak
- 1 University of Ljubljana Veterinary Faculty, National Veterinary Institute Gerbičeva 60 Ljubljana Slovenia
| | - Sava Lazić
- 2 Scientific Veterinary Institute ‘Novi Sad’ Novi Sad Serbia
| | - Diana Lupulović
- 2 Scientific Veterinary Institute ‘Novi Sad’ Novi Sad Serbia
| | | | - Zsolt Becskei
- 3 University of Belgrade Department for Animal Husbandry, Faculty of Veterinary Medicine Belgrade Serbia
| | - Radoslav Došen
- 2 Scientific Veterinary Institute ‘Novi Sad’ Novi Sad Serbia
| | - Tamaš Petrović
- 1 University of Ljubljana Veterinary Faculty, National Veterinary Institute Gerbičeva 60 Ljubljana Slovenia
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Jamnikar Ciglenečki U, Toplak I. Development of a real-time RT-PCR assay with TaqMan probe for specific detection of acute bee paralysis virus. J Virol Methods 2012; 184:63-8. [PMID: 22609890 DOI: 10.1016/j.jviromet.2012.05.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Revised: 05/07/2012] [Accepted: 05/10/2012] [Indexed: 11/18/2022]
Abstract
Real-time polymerase chain reaction (real-time PCR) is an accurate, rapid and reliable method that can be used for the detection and also for the quantitation of specific DNA molecules. It can be non-specific, with intercalating dyes (SYBR Green I dye) able to bind to any dsDNA, or specific with a probe (TaqMan), whereby the probe is designed to bind within the amplified PCR fragment. A new real-time reverse transcription and polymerase chain reaction (real time RT-PCR) assay with TaqMan probe for specific detection of acute bee paralysis virus was designed. The assay was optimized to be highly sensitive and analytically specific and tested with a selection of genetically diverse ABPV strains originating from Slovenia, the United Kingdom (UK), Hungary and Germany. The detection limit of the assay and sensitivity comparisons with conventional RT-PCR were analyzed and this assay can detect a minimum of 44 copies of ABPV/reaction and is 230 times more sensitive than conventional RT-PCR. In addition, the assay is highly reproducible, with an average slope of standard curve made of ten-fold dilutions of standard copies/reaction -3.479±0.19 and an average slope of standard curve made of ten-fold dilutions of RNA -3.409±0.18.
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Affiliation(s)
- Urška Jamnikar Ciglenečki
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Gerbičeva 60, 1000 Ljubljana, Slovenia.
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Toplak I, Rihtarič D, Hostnik P, Grom J, Stukelj M, Valenčak Z. Identification of a genetically diverse sequence of porcine reproductive and respiratory syndrome virus in Slovenia and the impact on the sensitivity of four molecular tests. J Virol Methods 2011; 179:51-6. [PMID: 22001545 DOI: 10.1016/j.jviromet.2011.09.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 09/16/2011] [Accepted: 09/26/2011] [Indexed: 10/17/2022]
Abstract
A total 91 serum samples and 51 pig tissue samples were collected between October 2009 and June 2010 from 30 herds, where a clinical picture of infection or/and porcine reproductive and respiratory syndrome (PRRS) antibody-positive pigs were detected. Of the 142 samples tested, 65 (45.8%) were identified as porcine reproductive and respiratory syndrome virus (PRRSV) positive by a one-step reverse transcription and polymerase chain reaction (RT-PCR). The sequencing results of 258 nucleotides in ORF7 from 30 herds with PRRSV-positive samples revealed the circulation of six genetically different strains of PRRSV, all belonging to the Subtype 1 (Type I). Twenty-three (76.6%) of the thirty positive herds were infected with a genetically identical cluster, with 98.9-100% nucleotide identity between the herds, representing the detection of a new strain of PRRSV in Europe, not published previously. From these 23 herds, positive PRRSV samples were detected with gel-based RT-PCR, but all gave false-negative results with two commercial real-time kits. When using a third commercial real-time kit, 28 (93.3%) of 30 positive samples in gel-based RT-PCR were detected as the Type I, confirming that the sensitivity of this real-time kit is much greater than the sensitivity of the previous two. The influence of new genetic variants of PRRSV circulating in Slovenia on molecular diagnosis and the control of the infection is discussed.
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Affiliation(s)
- I Toplak
- University of Ljubljana, Institute of Microbiology and Parasitology, Veterinary Faculty, Gerbičeva 60, 1000 Ljubljana, Slovenia.
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Henigman U, Biasizzo M, Vadnjal S, Kirbiš A, Toplak I, Barlič-Maganja D. Detection of Vibrio parahaemolyticus in Mediterranean mussels (Mytilus galloprovincialis) in Slovenia. Acta Vet Hung 2011; 59:155-64. [PMID: 21665569 DOI: 10.1556/avet.2011.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The aim of this study was to determine the prevalence of Vibrio parahaemolyticus in shellfish samples harvested along the Slovenian coast. Shellfish samples of Mediterranean mussels (Mytilus galloprovincialis) were collected along the Slovenian coast at four locations (Seča, Piran, Strunjan and Debeli Rtič) between 2006 and 2008. Samples were examined and analysed for the presence of V. parahaemolyticus by conventional and molecular methods. The presence of Vibrio in the samples was examined by conventional methods on plate grown bacterial cells before and after enrichment in alkaline saline peptone water (ASPW). PCR methods were used for the detection of V. parahaemolyticus-specific toxR and tlh genes and of the virulence-associated tdh and trh genes. Out of 168 samples examined, 24 were positive for toxR and tlh genes by PCR from enrichment broth. Five out of 62 (8.1%), 4 out of 32 (12.5%) and 15 out of 74 (20.2%) samples were positive in 2006, 2007 and 2008, respectively. Colonies of V. parahaemolyticus were isolated from only one sample positive for V. parahaemolyticus by PCR.
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Affiliation(s)
- Urška Henigman
- 1 University of Ljubljana Institute for Food Hygiene, Veterinary Faculty Gerbičeva 60 1000 Ljubljana Slovenia
| | - Majda Biasizzo
- 1 University of Ljubljana Institute for Food Hygiene, Veterinary Faculty Gerbičeva 60 1000 Ljubljana Slovenia
| | - Stanka Vadnjal
- 1 University of Ljubljana Institute for Food Hygiene, Veterinary Faculty Gerbičeva 60 1000 Ljubljana Slovenia
| | - Andrej Kirbiš
- 1 University of Ljubljana Institute for Food Hygiene, Veterinary Faculty Gerbičeva 60 1000 Ljubljana Slovenia
| | - Ivan Toplak
- 2 University of Ljubljana Institute for Microbiology and Parasitology, Virology Unit Ljubljana Slovenia
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Rihtarič D, Hostnik P, Grom J, Toplak I. Molecular epidemiology of the rabies virus in Slovenia 1994-2010. Vet Microbiol 2011; 152:181-6. [PMID: 21571453 DOI: 10.1016/j.vetmic.2011.04.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Revised: 04/04/2011] [Accepted: 04/14/2011] [Indexed: 10/18/2022]
Abstract
A molecular epidemiology study was performed on a selection of 30 rabies-positive brain samples collected between 1994 and 2010 in Slovenia and originating from the red fox (n=19), badger (n=3), cattle (n=3), dog (n=2), cat (n=1), marten (n=1) and horse (n=1). Based on the comparison of 1092 and 672 nucleotide sequences of nucleoprotein (N) and partial glycoprotein (G) gene regions, a low genetic diversity of the circulating strains was detected, but both phylogenetic trees were consistent with the topology where partial nucleoprotein or glycoprotein genes were used. A high sequence identity in the N and G gene to rabies virus isolates from neighbouring countries was found. The Slovenian strains were clearly different from the vaccine strains SAD B19 and SAD Bern, which have been used in Slovenia since 1988.
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Affiliation(s)
- D Rihtarič
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Virology Unit, Gerbičeva 60, 1115 Ljubljana, Slovenia
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Toplak I, Hostnik P, Rihtaric D, Olesen NJ, Skall HF, Jencic V. First isolation and genotyping of viruses from recent outbreaks of viral haemorrhagic septicaemia (VHS) in Slovenia. Dis Aquat Organ 2010; 92:21-29. [PMID: 21166311 DOI: 10.3354/dao02251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In November and December 2007, the virus causing viral haemorrhagic septicaemia (VHS) was detected in rainbow trout Oncorhynchus mykiss from 2 fish farms in Slovenia. During 2008 and 2009 the infection spread only among rainbow trout farms and 4 new outbreaks were confirmed. High mortality and clinical signs of VHS were observed among the diseased fish. VHSV was confirmed by virus isolation, immunoperoxidase test, reverse transcriptase polymerase chain reaction (RT-PCR) and phylogenetic analysis. Based on 1 complete (1524 nucleotides [nt]) and 9 partial (600 nt) glycoprotein gene nucleotide sequences, 9 VHSV isolates from the 6 VHS outbreaks were genetically closely related (99 to 100% identity), and were classified into the Subgroup I-a of Genotype I, most closely related to the German isolates Dstg21-07, Dstg36-06, and Dstg54-1-07 (99 to 100% identity). Phylogenetic analysis and epidemiological investigations confirmed that the VHS virus had been (re)introduced with imported live fish, and that subsequent outbreaks were linked to the initial infection. Our study shows that direct nucleotide sequencing of RT-PCR products, amplified from the tissue of VHSV-infected fish, represents a reliable tool for fast routine genotyping in diagnostic laboratories. This is the first report of a natural epidemic associated with VHSV infection in Slovenia since the eradication of the disease in 1977.
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Affiliation(s)
- Ivan Toplak
- Virology Unit, Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbiceva 60, 1115 Ljubljana, Slovenia.
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Rihtarič D, Hostnik P, Steyer A, Grom J, Toplak I. Identification of SARS-like coronaviruses in horseshoe bats (Rhinolophus hipposideros) in Slovenia. Arch Virol 2010; 155:507-14. [PMID: 20217155 PMCID: PMC7087122 DOI: 10.1007/s00705-010-0612-5] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2009] [Accepted: 01/04/2010] [Indexed: 01/12/2023]
Abstract
Bats have been identified as a natural reservoir for an increasing number of emerging zoonotic viruses, such as Hendra virus, Nipah virus, Ebola virus, Marburg virus, rabies and other lyssaviruses. Recently, a large number of viruses closely related to members of the genus Coronavirus have been associated with severe acute respiratory syndrome (SARS) and detected in bat species. In this study, samples were collected from 106 live bats of seven different bat species from 27 different locations in Slovenia. Coronaviruses were detected by RT-PCR in 14 out of 36 horseshoe bat (Rhinolophus hipposideros) fecal samples, with 38.8% virus prevalence. Sequence analysis of a 405-nucleotide region of the highly conserved RNA polymerase gene (pol) showed that all coronaviruses detected in this study are genetically closely related, with 99.5-100% nucleotide identity, and belong to group 2 of the coronaviruses. The most closely related virus sequence in GenBank was SARS bat isolate Rp3/2004 (DQ071615) within the SARS-like CoV cluster, sharing 85% nucleotide identity and 95.6% amino acid identity. The potential risk of a new group of bat coronaviruses as a reservoir for human infections is highly suspected, and further molecular epidemiologic studies of these bat coronaviruses are needed.
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Affiliation(s)
- Danijela Rihtarič
- Virology Unit, Veterinary Faculty, Institute of Microbiology and Parasitology, University of Ljubljana, Gerbičeva 60, 1115 Ljubljana, Slovenia
| | - Peter Hostnik
- Virology Unit, Veterinary Faculty, Institute of Microbiology and Parasitology, University of Ljubljana, Gerbičeva 60, 1115 Ljubljana, Slovenia
| | - Andrej Steyer
- Faculty of Medicine, Institute of Microbiology and Immunology, University of Ljubljana, Zaloška 4, 1104 Ljubljana, Slovenia
| | - Jože Grom
- Virology Unit, Veterinary Faculty, Institute of Microbiology and Parasitology, University of Ljubljana, Gerbičeva 60, 1115 Ljubljana, Slovenia
| | - Ivan Toplak
- Virology Unit, Veterinary Faculty, Institute of Microbiology and Parasitology, University of Ljubljana, Gerbičeva 60, 1115 Ljubljana, Slovenia
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Jamnikar Ciglenečki U, Grom J, Toplak I, Jemeršić L, Barlič-Maganja D. Real-time RT-PCR assay for rapid and specific detection of classical swine fever virus: Comparison of SYBR Green and TaqMan MGB detection methods using novel MGB probes. J Virol Methods 2008; 147:257-64. [DOI: 10.1016/j.jviromet.2007.09.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2007] [Revised: 09/07/2007] [Accepted: 09/17/2007] [Indexed: 11/26/2022]
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Mankoc S, Hostnik P, Grom J, Toplak I, Klobucar I, Kosec M, Barlic-Maganja D. Comparison of different molecular methods for assessment of equine arteritis virus (EAV) infection: a novel one-step MGB real-time RT-PCR assay, PCR-ELISA and classical RT-PCR for detection of highly diverse sequences of Slovenian EAV variants. J Virol Methods 2007; 146:341-54. [PMID: 17854913 DOI: 10.1016/j.jviromet.2007.07.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2007] [Revised: 07/23/2007] [Accepted: 07/24/2007] [Indexed: 11/17/2022]
Abstract
In the present study, a new one-step real-time reverse transcription-polymerase chain reaction (RT-PCR) strategy with minor-groove-binder (MGB) technology for the detection of EAV from 40 semen samples of Slovenian carrier stallions was tested. A novel MGB probe (EAVMGBpr) and a reverse primer (EAV-R) based on the multiple sequence alignment of 49 different EAV strain sequences of the highly conserved ORF7 (nucleocapsid gene) were designed. The performance of the assay was compared with different molecular detection methods. Three different primer pairs targeting the ORF1b and ORF7 were used, respectively. The real-time RT-PCR assay was at least 2 log(10) more sensitive than the classical RT-PCR and at least 1 log(10) more sensitive than the primer set used in the semi-nested PCR. The specificities of the amplification reactions were confirmed with biotinylated probes in the PCR-enzyme-linked immunosorbent assay (PCR-ELISA). Under the conditions described in our study, the sensitivity of the real-time RT-PCR was found to be superior to the PCR-ELISA assay. Thus, while the PCR-ELISA method was found to be both relatively demanding and time consuming, better sensitivity coupled with high specificity and speed of the assay makes the real-time RT-PCR a valuable tool for diagnosis of EAV infection.
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Affiliation(s)
- S Mankoc
- Virology Unit, Institute for Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbiceva 60, SI-1115 Ljubljana, Slovenia.
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Grom J, Hostnik P, Toplak I, Barlic-Maganja D. Molecular detection of BHV-1 in artificially inoculated semen and in the semen of a latently infected bull treated with dexamethasone. Vet J 2006; 171:539-44. [PMID: 16624722 DOI: 10.1016/j.tvjl.2004.11.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/09/2004] [Indexed: 11/25/2022]
Abstract
Two polymerase chain reaction (PCR) assays specific for glycoprotein B (gB) and glycoprotein E (gE) gene detection, respectively, were adopted for the detection of bovine herpesvirus-1 (BHV-1) in naturally infected bulls. The methods were tested on bovine semen artificially inoculated with BHV-1 and were compared with an optimised virus isolation method. Raw and extended semen samples were diluted in minimal essential medium (MEM) and spiked with equal dose of BHV-1. The extended semen was found to be more toxic for the cells than the raw semen, while the viral DNA could be detected by the PCR method in all tested dilutions of raw and extended semen samples. The sensitivity of both methods was compared also for BHV-1 detection in semen, nasal swabs and leucocytes of a seropositive bull in a different time period after virus reactivation with dexamethasone treatment. The sensitivity of virus detection by the PCR method was equivalent to that of virus isolation in cell culture. However, PCR was shown to be faster and easier to perform and may be a good alternative to virus isolation especially when bovine semen has to be screened for BHV-1 prior to artificial insemination.
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Affiliation(s)
- Joze Grom
- Veterinary Faculty, Virology Unit, University of Ljubljana, Gerbiceva 60, SI-1115 Ljubljana, Slovenia
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Abstract
Red foxes (Vulpes vulpes) are the main reservoir of rabies in Slovenia, whereas cases of rabies in other wildlife species occur sporadically. In 1995, a program of oral vaccination of wildlife in Slovenia was initiated; baits with oral vaccine were distributed by air at a density of 20 baits/km(2). During 1995, when the oral vaccination program was started, 1,089 cases of rabies (including both wild and domestic animals) were reported. Five years later (1999), only six positive animals were detected among 1,195 tested (0.5%). Despite an increase in bait density (25 baits/km(2)) during the years 2000 and 2001, reported rabies cases increased to 115 and 135, respectively. In 2003, following initiation of a new bait-dropping strategy, which incorporated perpendicular rather than parallel flight lines, the number of rabies cases decreased to eight.
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Affiliation(s)
- Peter Hostnik
- University of Ljubljana, Veterinary Faculty, Gerbiceva 60, 1115 Ljubljana, Slovenia.
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Krapez U, Barlic-Maganja D, Toplak I, Hostnik P, Rojs OZ. Biological and Molecular Characterization of Chicken Anemia Virus Isolates from Slovenia. Avian Dis 2006; 50:69-76. [PMID: 16617985 DOI: 10.1637/7413.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The presence of chicken anemia virus (CAV) in Slovenia was confirmed by inoculation of 1-day-old chickens without antibodies against CAV and isolation of the virus on the Marek's disease chicken cell-MSB1 line and by polymerase chain reaction (PCR). Experimental inoculation of 1-day-old chickens resulted in lower hematocrit values, atrophy of the thymus, and atrophy of bone marrow. CAV was confirmed by PCR in the thymus, bone marrow, bursa of Fabricius, liver, spleen, ileocecal tonsils, duodenum, and proventriculus. The nucleotide sequence of the whole viral protein (VP)1 gene was determined by direct sequencing. Alignment of VP1 nucleotide sequences of Slovenian CAV isolates (CAV-69/00, CAV-469/01, and CAV-130/03) showed 99.4% to 99.9% homology. The VP1 nucleotide sequence alignment of Slovenian isolates with 19 other CAV strains demonstrated 94.4% to 99.4% homology. Slovenian isolates shared highest homology with the BD-3 isolate from Bangladesh. Alignment of the deduced VP1 amino acids showed that the Slovenian isolates shared 100% homology and had an amino acid sequence most similar to the BD-3 strain from Bangladesh (99.6%) and were 99.1% similar to the G6 strain from Japan and the L-028 strain from the United States. The Slovenian isolates were least similar (96.6%) to the 82-2 strain from Japan. A phylogeneric analysis on the basis of the alignment of the VP1 amino acids showed that CAV isolates used in the study formed three groups that indicated the possible existence of genetic groups among CAV strains. The CAV isolates were grouped together independent of their geographic origin and pathogenicity.
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Affiliation(s)
- Uros Krapez
- Institute of Poultry Health, Veterinary Faculty, University of Ljubljana, Gerbikeva 60, 1000 Ljubljana, Slovenia
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Barlic-Maganja D, Krapez U, Mankoc S, Toplak I, Rojs OZ. Fusion and Matrix Protein Gene Sequence Analysis of Paramyxoviruses of Type 1(PMV-1) Isolated from Pigeons in Slovenia. Virus Genes 2005; 31:265-73. [PMID: 16175332 DOI: 10.1007/s11262-005-3240-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2005] [Revised: 04/07/2005] [Accepted: 04/07/2005] [Indexed: 11/26/2022]
Abstract
Paramyxoviruses of type 1 (PMV-l) isolated from pigeons were genetically analyzed. A part of the fusion and the matrix protein genes were amplified and sequenced, Typical amino acid sequences associated with virulence were determined at the fusion protein cleavage site in all PMV-1 isolates. All Slovene pigeon PMV-1 strains share high amino acid sequence similarity with other pigeon strains. In the phylogenetic tree, they are clustered together with pigeon PMV-1 isolates with moderate pathogenicity. Phylogenetic analysis obtained from the fusion and the matrix protein gene alignments showed the same branching order. Viruses circulating among pigeons were found to form quite unique lineage of virulent NDV strains.
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Affiliation(s)
- Darja Barlic-Maganja
- Veterinary Faculty, University of Ljubljana, Gerbiceva 60, SI-1115, Ljubljana, Slovenia.
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Lipej Z, Segalés J, Toplak I, Sostarić B, Roić B, Lojkić M, Hostnik P, Grom J, Barlic-Maganja D, Zarković K, Oraić D. Postweaning multisystemic wasting syndrome (PMWS) in pigs in Croatia: detection and characterisation of porcine circovirus type 2 (PCV2). Acta Vet Hung 2005; 53:385-96. [PMID: 16156133 DOI: 10.1556/avet.53.2005.3.11] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The objective of this study was to characterise porcine circovirus type 2 (PCV2) from pigs with naturally occurring postweaning multisystemic wasting syndrome (PMWS) in Croatia, and to determine the epizootiological, clinical and pathomorphological features of the disease. During a systematic health monitoring programme conducted in the period from January 2002 to June 2003, PMWS was suspected on eight different pig-producing farms in Croatia. The diagnosis of PMWS met all three key criteria: the presence of compatible clinical signs, the presence of the characteristic microscopic lymphoid lesions, and the detection of PCV2 within the lesions by polymerase chain reaction (PCR) and by in situ hybridisation (ISH). Moreover, PCV2 DNA from swine tissues was extracted and sequenced. The phylogenetic analysis of 4 Croatian PCV2 strains showed close relationship to PCV2 strains isolated in Slovenia, France, the Netherlands, the United Kingdom, China and Hungary. PCV2 was also demonstrated by electron microscopy in the lymph node of an affected animal. This is the first demonstration of PMWS in Croatia based on all scientifically accepted diagnostic criteria.
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Affiliation(s)
- Z Lipej
- Croatian Veterinary Institute, Zagreb, Savska c 143, Croatia.
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Toplak I, Sandvik T, Barlič-Maganja D, Grom J, Paton DJ. Corrigendum to “Genetic typing of bovine viral diarrhoea virus: most Slovenian isolates are of genotypes 1d and 1f” [Vet. Microbiol. 99 (2004) 175–185]. Vet Microbiol 2005. [DOI: 10.1016/j.vetmic.2004.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Jemersić L, Cvetnić Z, Toplak I, Spicić S, Grom J, Barlic-Maganja D, Terzić S, Hostnik P, Lojkić M, Humski A, Habrun B, Krt B. Detection and genetic characterization of porcine circovirus type 2 (PCV2) in pigs from Croatia. Res Vet Sci 2004; 77:171-5. [PMID: 15196907 DOI: 10.1016/j.rvsc.2004.04.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/20/2004] [Indexed: 11/17/2022]
Abstract
Porcine circovirus type 2 (PCV2) from the Circoviridae family has recently been associated with two serious diseases of swine, post-weaning multisystemic wasting syndrome (PMWS) and porcine dermatitis and nephropathy syndrome (PDNS). During 2002, several outbreaks of clinical disease in pigs with weights ranging from 10 to 70 kg occurred on four farms in different locations in Croatia. The signs were consistent with PMWS and PDNS. Apart from progressive weight loss, pneumonia and/or diarrhoea, multifocal erythematous skin lesions and dermal necrosis were also observed. The PCR results obtained from PCV2 specific oligonucleotide primers confirmed a PCV2 infection. In addition, archive samples that were classical swine fever virus positive and derived from domestic pigs during an outbreak in 1997 were included in this study and one out of the three isolates was found to be positive for PCV2. For a better epizootiological understanding, genetic typing of representative isolates was carried out and compared with available isolates reported in the GenBank databases.
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Affiliation(s)
- L Jemersić
- Virology Department, Croatian Veterinary Institute, Savska cesta 143, 10000 Zagreb, Croatia.
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Affiliation(s)
- I Toplak
- Department of Virology, Veterinary Faculty, University of Ljubljana, Gerbiceva 60, 1115, Slovenia
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Barlic-Maganja D, Grom J, Toplak I, Hostnik P. Detection of foot and mouth disease virus by RT-PCR and microplate hydridization assay using inactivated viral antigens. Vet Res Commun 2004; 28:149-58. [PMID: 14992244 DOI: 10.1023/b:verc.0000012111.87237.30] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A single step RT-PCR was tested for detection of foot and mouth disease virus (FMDV) and immunoenzymatic determination of amplified products in a microplate hybridization assay. Inactivated reference strains (ELISA antigen) of all seven serotypes were used to optimize the test. Oligonucleotide primers were selected from two different genomic regions coding for RNA polymerase and VP1 protein, respectively. The RT-PCR used to amplify the polymerase gene specific RNA detected FMDV strains A, C, O, Asial and SAT1, and the identity of the fragments obtained was confirmed with a specific internal biotin-labelled capture probe. For the amplification of the VP1 genome region, two sets of oligonucleotide primers were used. One primer pair was successfully applied for the detection of serotypes A, C, O and Asial and a second one for serotypes SAT1, SAT2, SAT3. The specific probe enabled the detection of all the amplified products in a PCR ELISA test. By comparison with antigen ELISA, the PCR ELISA method allowed the detection of smaller amounts of FMDV in the inactivated material examined. The application of molecular diagnostic methods to inactivated antigens offers a good alternative procedure for developing and optimizing a sensitive method for detection of FMDV in laboratories that are not allowed to work with viable FMDV.
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Affiliation(s)
- D Barlic-Maganja
- University of Ljubljana, Institute of Microbiology and Parasitology, Virology Unit, Gerbiceva 60, SI-1115 Ljubljana, Slovenia.
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Toplak I, Sandvik T, Barlic-Maganja D, Grom J, Paton DJ. Genetic typing of bovine viral diarrhoea virus: most Slovenian isolates are of genotypes 1d and 1f. Vet Microbiol 2004; 99:175-85. [PMID: 15066720 DOI: 10.1016/j.vetmic.2003.12.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2002] [Revised: 06/23/2003] [Accepted: 12/10/2003] [Indexed: 11/17/2022]
Abstract
A selection of 43 bovine viral diarrhoea viruses isolated from mainly persistently infected cattle on 23 Slovenian farms between 1997 and 2001 were characterised genetically. Viral RNA was extracted from infected cell cultures, reverse transcribed and amplified by PCR with primers targeting the 5'-UTR and the N(pro) gene, followed by direct sequencing of purified PCR products obtained for both genomic regions. The N(pro) sequences provided the best genetic resolution, and gave also higher statistical support for phylogenetic classification of the viruses. Thirty-eight of the Slovenian isolates were of genetic subtypes 1d and 1f, four were 1b, and one subtype 1g. No BVDV type 2 viruses were found. This genetic prevalence matched those previously reported for neighbouring countries, as opposed to findings reported for more distant European countries, e.g. France, Spain and the UK. From eight cattle herds several virus isolates were analysed; with one exception all isolates from each herd were of the same genetic group. Extended sequencing of the N(pro) and part of the C gene of virus isolates with identical 5'-UTR sequences allowed differentiation between isolates obtained at different times from one herd.
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Affiliation(s)
- Ivan Toplak
- Department of Virology, Veterinary Faculty, 1115 Ljubljana, Slovenia
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Terzić S, Jemersić L, Lojkić M, Madić J, Grom J, Toplak I, Sver L, Valpotić I. Comparison of antibody values in sera of pigs vaccinated with a subunit or an attenuated vaccine against classical swine fever. Vet Res Commun 2003; 27:329-39. [PMID: 12872833 DOI: 10.1023/a:1024040326550] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Ten pigs, aged 85 days, were vaccinated with a subunit vaccine containing 32 microg of classical swine fever virus glycoprotein E2 (gp E2) (group 1), and a further 10 pigs were vaccinated with a C strain vaccine (10(4+/-0.15) TCID50/ml), produced by amplification in minipig kidney (MPK) cell culture (group 2). Nine non-vaccinated pigs served as a control group (group 3). Serum samples were collected before (day 0) and at 4, 10, 21 and 28 days after vaccination and were analysed by two commercially available enzyme immunoassays and by a neutralizing peroxidase-linked assay (NPLA). At the same times, peripheral blood was taken for determining the total leukocyte count and the body temperature was taken daily. Antibodies were not detected in serum samples collected before vaccination (day 0), and no side-effects that could be connected with vaccination were observed during the trial. Ten days after vaccination 6/10 pigs vaccinated with the subunit vaccine were seropositive. On days 21 and 28, the ratios of serologically positive to vaccinated pigs were 9/10 and 10/10, respectively. Four of the ten pigs that were vaccinated with the C strain vaccine were positive on day 21 and 9/10 on day 28. However, the results of the NPLA showed that only 4/10 pigs had an antibody titre > 1:32 at the end of the trial in both the vaccinated groups, even though the subunit vaccine initiated an earlier and higher level of neutralizing antibodies than the vaccine produced from the C strain. Challenge was performed 28 days after vaccination on four randomly selected pigs from both vaccinated groups. The pigs survived the challenge without showing any clinical signs of classical swine fever (CSF), while two nonvaccinated control pigs died on the 10th and 12th days after infection.
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Affiliation(s)
- S Terzić
- Croatian Veterinary Institute, Savska cesta 143, PO Box 883, 10000 Zagreb, Croatia.
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Hostnik P, Barlic-Maganja D, Toplak I, Grom J. The persistence of rabies virus antibodies in the sera of fox cubs. J Vet Med B Infect Dis Vet Public Health 2003; 50:204-6. [PMID: 12916696 DOI: 10.1046/j.1439-0450.2003.00660.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The persistence of maternal antibodies transfer from rabies-immune vixens to their fox cubs was studied. Eight vixens (Vulpes vulpes) were vaccinated 1 month before pregnancy with Lysvulpen vaccine for oral vaccination of foxes. Twenty-one were foxes born at the first half of April. The geometrical mean titre of rabies neutralizing antibodies of fox cubs sampled in May was 1.31 IU/ml and has dropped successively to 0.54 IU/ml in June samples and to 0.18 IU/ml in July samples. It has been proven that the duration of rabies maternal antibodies in fox cubs was limited to 2 months after birth.
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Affiliation(s)
- P Hostnik
- Institute of Microbiology and Parasitology, Virology Unit, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia.
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Hostnik P, Barlic-Maganja D, Strancar M, Jencic V, Toplak I, Grom J. Influence of storage temperature on infectious hematopoietic necrosis virus detection by cell culture isolation and RT-PCR methods. Dis Aquat Organ 2002; 52:179-184. [PMID: 12553445 DOI: 10.3354/dao052179] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The detection of infectious hematopoietic necrosis virus (IHNV) in infected rainbow trout Oncorhynchus mykiss and in cell culture supernatants stored under different conditions was studied. IHNV-positive fish visceral organ homogenates and cell culture supernatants were incubated at 4 and 25 degrees C. Virus titre was measured by virus isolation on epithelioma papulosum cyprini (EPC) cells and the IHNV RNA was detected by RT-PCR and semi-nested RT-PCR. The influence of repeated freezing and thawing on the virus isolation from organ homogenates and from cell culture supernatants was studied as well. It was possible to isolate the virus from IHNV-positive organ material during the 3 d of incubation at 4 degrees C but, only on the first day of incubation at 25 degrees C. Viral RNA could be amplified during the incubation period of 35 d at 4 degrees C but only during 8 d of incubation at 25 degrees C. In IHNV-infected cell culture supernatant stored at 4 degrees C, it was possible to detect virus for 36 and 16 d in supernatant stored at 25 degrees C. Viral RNA could be followed by using molecular methods during the entire experimental period of 123 d. Each cycle of freezing and thawing of samples resulted in a reduction of IHNV titre in the suspension of visceral organs, while the virus titre in cell culture supernatant remained almost the same following 33 freezing-thawing cycles. The present results show that rapid laboratory processing and storage of potentially virus-containing tissue samples as well as the use of different detection methods are very important for efficient IHNV diagnosis.
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Affiliation(s)
- Peter Hostnik
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Virology Unit, Gerbiceva 60, 1115 Ljubljana, Slovenia.
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