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Esteban-Ballesteros M, Sanchis J, Gutiérrez-Corbo C, Balaña-Fouce R, Rojo-Vázquez FA, González-Lanza C, Martínez-Valladares M. In vitro anthelmintic activity and safety of different plant species against the ovine gastrointestinal nematode Teladorsagia circumcincta. Res Vet Sci 2019; 123:153-158. [PMID: 30677615 DOI: 10.1016/j.rvsc.2019.01.004] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 12/26/2018] [Accepted: 01/03/2019] [Indexed: 10/27/2022]
Abstract
The present study was conducted to evaluate the in vitro anthelmintic activity and safety of methanolic and aqueous extracts of 9 plants against the ovine GIN Teladorsagia circumcincta. Initially the ovicidal efficacy of all extracts was tested at 50 mg/ml and at 1%, this last concentration for the methanolic extract of Elettaria cardamomum, by the Egg Hatch Assay. In those extracts with efficacy higher than 95%, the effective concentration required to inhibit 50% of egg hatching (EC50) and their cytotoxicity, as the lethal dose 50 (LC50), was also measured. The aqueous extracts of Aesculus hippocastanum, Isatis tinctoria, Chelidonium majus, E. cardamomum and Sisymbrium irio, with EC50 values ranging 1.30-2.88 mg/ml, and the aqueous extract of Jasminum polyanthum with a value of 6.41 mg/ml, showed the highest activities. The aqueous extract of J. polyanthum was the safest extract, followed by methanolic extract of E. cardamomum and aqueous extract of S. irio, all of them with a Selective Index higher than 1. According to our results, there is no correlation between the amount of total phenols or total tannins with the anthelmintic activity of the plants tested. Although results need to be interpreted with caution, as in vitro activity may not automatically translate into in vivo efficacy, those extracts with SI equal or higher than 1 and EC50 equal or lower than 6 mg/ml, could be taken into account for being used subsequently as feed or food additives in infected sheep.
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Affiliation(s)
- Myriam Esteban-Ballesteros
- Instituto de Ganadería de Montaña (CSIC-Universidad de León), Grulleros 24346, León, Spain; Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, León 24071, Spain
| | - Jaime Sanchis
- Departamento de Parasitología, Universidad de la República (Regional Norte), Salto, Uruguay
| | - Camino Gutiérrez-Corbo
- Departamento de Ciencias Biomédicas, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, León 24071, Spain
| | - Rafael Balaña-Fouce
- Departamento de Ciencias Biomédicas, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, León 24071, Spain
| | - Francisco A Rojo-Vázquez
- Instituto de Ganadería de Montaña (CSIC-Universidad de León), Grulleros 24346, León, Spain; Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, León 24071, Spain
| | - Camino González-Lanza
- Instituto de Ganadería de Montaña (CSIC-Universidad de León), Grulleros 24346, León, Spain
| | - María Martínez-Valladares
- Instituto de Ganadería de Montaña (CSIC-Universidad de León), Grulleros 24346, León, Spain; Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, León 24071, Spain.
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Esteban-Ballesteros M, Rojo-Vázquez FA, Skuce PJ, Melville L, González-Lanza C, Martínez-Valladares M. Quantification of resistant alleles in the β-tubulin gene of field strains of gastrointestinal nematodes and their relation with the faecal egg count reduction test. BMC Vet Res 2017; 13:71. [PMID: 28320391 PMCID: PMC5359865 DOI: 10.1186/s12917-017-0992-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 03/16/2017] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Benzimidazole (BZ) resistance in gastrointestinal nematodes is associated with a single nucleotide polymorphism (SNP) at codons 167, 198 and 200 in the isotype 1 of beta-tubulin gene although in some species these SNPs have also been associated with resistance to macrocyclic lactones. In the present study we compared the levels of resistance in Teladorsagia circumcincta and Trichostrongylus colubriformis by means of the faecal egg reduction test (FECRT) and the percentage of resistant alleles obtained after pyrosequencing. The study was conducted in 10 naturally infected sheep flocks. Each flock was divided into three groups: i) group treated with albendazole (ABZ); ii) group treated with ivermectin (IVM); iii) untreated group. The number of eggs excreted per gram of faeces was estimated at day 0 and 14 post-treatment. RESULTS Resistance to ABZ was observed in 12.5% (1/8) of the flocks and to IVM in 44.4% (4/9) of them. One flock was resistant to both drugs according to FECRT. Coprocultures were performed at the same dates to collect L3 for DNA extraction from pooled larvae and to determine the resistant allele frequencies by pyrosequencing analysis. In T. circumcincta, SNPs were not found at any of the three codons before treatment; after the administration of ABZ, SNPs were present only in two different flocks, one of them with a frequency of 23.8% at SNP 167, and the other 13.2% % at SNP 198. In relation to T. colubriformis, we found the SNP200 before treatment in 33.3% (3/9) of the flocks with values between 48.5 and 87.8%. After treatment with ABZ and IVM, the prevalence of this SNP increased to 75 and 100% of the flocks, with a mean frequency of 95.1% and 82.6%, respectively. CONCLUSION The frequencies observed for SNP200 in T. colubriformis indicate that the presence of resistance is more common than revealed by the FECRT.
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Affiliation(s)
- Myriam Esteban-Ballesteros
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain
- Instituto de Ganadería de Montaña (CSIC-Universidad de León), Finca Marzanas, Grulleros, 24346 León, Spain
| | - Francisco A. Rojo-Vázquez
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain
- Instituto de Ganadería de Montaña (CSIC-Universidad de León), Finca Marzanas, Grulleros, 24346 León, Spain
| | - Philip J. Skuce
- Moredun Research Institute, Pentland Science Park, Bush Loan, Edinburgh, UK
| | - Lynsey Melville
- Moredun Research Institute, Pentland Science Park, Bush Loan, Edinburgh, UK
| | - Camino González-Lanza
- Instituto de Ganadería de Montaña (CSIC-Universidad de León), Finca Marzanas, Grulleros, 24346 León, Spain
| | - María Martínez-Valladares
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain
- Instituto de Ganadería de Montaña (CSIC-Universidad de León), Finca Marzanas, Grulleros, 24346 León, Spain
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Iglesias-Piñeiro J, González-Warleta M, Castro-Hermida JA, Córdoba M, González-Lanza C, Manga-González Y, Mezo M. Transmission of Calicophoron daubneyi and Fasciola hepatica in Galicia (Spain): Temporal follow-up in the intermediate and definitive hosts. Parasit Vectors 2016; 9:610. [PMID: 27894356 PMCID: PMC5126829 DOI: 10.1186/s13071-016-1892-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [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: 08/08/2016] [Accepted: 11/17/2016] [Indexed: 12/27/2022] Open
Abstract
Background Paramphistomosis caused by Calicophoron daubneyi and fasciolosis caused by Fasciola hepatica are common parasitic diseases of livestock animals. Transmission of the diseases depends on the presence of intermediate hosts, i.e. freshwater gastropods such as lymnaeids. We carried out a 2-year-long study of the dynamics of the snail population acting as the intermediate host for these parasites, considering the population structure in terms of size/age and infection status. In addition, we determined the kinetics of trematode egg excretion in grazing cows. Generalized Additive Models (GAMs) were used to analyze the associations between different response variables and snail size, sampling month and weather-related variables. Results Of the molluscan species examined, Galba truncatula, Radix peregra, Anisus (Anisus) leucostoma and Pisidium casertanum (n = 2802), only G. truncatula was infected with C. daubneyi or F. hepatica, at prevalence rates of 8.2% and 4.4% respectively. The probability of infection with C. daubneyi or F. hepatica was linearly related to snail size, although in different ways (negative for C. daubneyi and positive for F. hepatica). The total snail population increased in winter, when specimens of all size classes were found. Infected snails were more abundant during spring-autumn. Mature cercariae of both parasites were found in most seasons. In the statistical models, the sampling month accounted for a high percentage (71.9–78.2%) of the observed variability in snail abundance. The inclusion of climatic variables in the models moderately increased the percentage of deviance explained (77.7–91.9%). Excretion of C. daubneyi eggs in cow faeces was always higher than that of F. hepatica eggs. Conclusions Particular care should be taken to prevent pastures and the surrounding environment being contaminated with parasite eggs during winter-spring, when the number of snails susceptible to miracidial infections is maximal. This is therefore the optimal time for treating grazing animals. Nevertheless, control of trematodosis based only on chemotherapy is difficult in an area such as the study area, where environmental factors favour the regular appearance of snail populations harbouring mature cercariae. Electronic supplementary material The online version of this article (doi:10.1186/s13071-016-1892-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Javier Iglesias-Piñeiro
- Departamento de Zooloxía, Xenética e Antropoloxía Física, Facultade de Bioloxía, Campus Vida, Universidade de Santiago de Compostela, 15706, Santiago de Compostela (A Coruña), Spain
| | - Marta González-Warleta
- Laboratorio de Parasitología, Centro de Investigaciones Agrarias de Mabegondo, Instituto Galego de Calidade Alimentaria-Xunta de Galicia, Carretera AC-542 de Betanzos a Mesón do Vento, Km 7, 15318, Abegondo (A Coruña), Spain
| | - José Antonio Castro-Hermida
- Laboratorio de Parasitología, Centro de Investigaciones Agrarias de Mabegondo, Instituto Galego de Calidade Alimentaria-Xunta de Galicia, Carretera AC-542 de Betanzos a Mesón do Vento, Km 7, 15318, Abegondo (A Coruña), Spain
| | - María Córdoba
- Department of Crop and Soil Science, Oregon State University, Corvallis, OR, 97331, USA
| | - Camino González-Lanza
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña, Consejo Superior de Investigaciones Científicas (CSIC)-ULE, 24346, Grulleros (León), Spain
| | - Yolanda Manga-González
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña, Consejo Superior de Investigaciones Científicas (CSIC)-ULE, 24346, Grulleros (León), Spain
| | - Mercedes Mezo
- Laboratorio de Parasitología, Centro de Investigaciones Agrarias de Mabegondo, Instituto Galego de Calidade Alimentaria-Xunta de Galicia, Carretera AC-542 de Betanzos a Mesón do Vento, Km 7, 15318, Abegondo (A Coruña), Spain.
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Castaño P, Fuertes M, Regidor-Cerrillo J, Ferre I, Fernández M, Ferreras MC, Moreno-Gonzalo J, González-Lanza C, Pereira-Bueno J, Katzer F, Ortega-Mora LM, Pérez V, Benavides J. Experimental ovine toxoplasmosis: influence of the gestational stage on the clinical course, lesion development and parasite distribution. Vet Res 2016; 47:43. [PMID: 26983883 PMCID: PMC4793618 DOI: 10.1186/s13567-016-0327-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2015] [Accepted: 02/24/2016] [Indexed: 01/30/2023] Open
Abstract
The relation between gestational age and foetal death risk in ovine toxoplasmosis is already known, but the mechanisms involved are not yet clear. In order to study how the stage of gestation influences these mechanisms, pregnant sheep of the same age and genetic background were orally dosed with 50 oocysts of Toxoplasma gondii (M4 isolate) at days 40 (G1), 90 (G2) and 120 (G3) of gestation. In each group, four animals were culled on the second, third and fourth week post infection (pi) in order to evaluate parasite load and distribution, and lesions in target organs. Ewes from G1 showed a longer period of hyperthermia than the other groups. Abortions occurred in all groups. While in G2 they were more frequent during the acute phase of the disease, in G3 they mainly occurred after day 20 pi. After challenge, parasite and lesions in the placentas and foetuses were detected from day 19 pi in G3 while in G2 or G1 they were only detected at day 26 pi. However, after initial detection at day 19 pi, parasite burden, measured through RT-PCR, in placenta or foetus of G3 did not increase significantly and, at in the third week pi it was lower than that measured in foetal liver or placenta from G1 to G3 respectively. These results show that the period of gestation clearly influences the parasite multiplication and development of lesions in the placenta and foetus and, as a consequence, the clinical course in ovine toxoplasmosis.
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Affiliation(s)
- Pablo Castaño
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Grulleros, 24346, León, Spain
| | - Miguel Fuertes
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Grulleros, 24346, León, Spain
| | - Javier Regidor-Cerrillo
- SALUVET, Animal Health Department, Faculty of Veterinary Sciences, Complutense University of Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain
| | - Ignacio Ferre
- SALUVET, Animal Health Department, Faculty of Veterinary Sciences, Complutense University of Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain
| | - Miguel Fernández
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Grulleros, 24346, León, Spain
| | - M Carmen Ferreras
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Grulleros, 24346, León, Spain
| | - Javier Moreno-Gonzalo
- SALUVET, Animal Health Department, Faculty of Veterinary Sciences, Complutense University of Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain
| | - Camino González-Lanza
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Grulleros, 24346, León, Spain
| | - Juana Pereira-Bueno
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Grulleros, 24346, León, Spain
| | - Frank Katzer
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Edinburgh, EH26 0PZ, UK
| | - Luis Miguel Ortega-Mora
- SALUVET, Animal Health Department, Faculty of Veterinary Sciences, Complutense University of Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain
| | - Valentín Pérez
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Grulleros, 24346, León, Spain
| | - Julio Benavides
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Grulleros, 24346, León, Spain.
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Castaño P, Fuertes M, Ferre I, Fernández M, Ferreras MDC, Moreno-Gonzalo J, González-Lanza C, Katzer F, Regidor-Cerrillo J, Ortega-Mora LM, Pérez V, Benavides J. Placental thrombosis in acute phase abortions during experimental Toxoplasma gondii infection in sheep. Vet Res 2014; 45:9. [PMID: 24475786 PMCID: PMC3931317 DOI: 10.1186/1297-9716-45-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Accepted: 01/16/2014] [Indexed: 02/08/2023] Open
Abstract
After oral administration of ewes during mid gestation with 2000 freshly prepared sporulated oocysts of T. gondii isolate M4, abortions occurred between days 7 and 11 in 91.6% of pregnant and infected ewes. Afterwards, a further infection was carried out at late gestation in another group of sheep with 500 sporulated oocysts. Abortions happened again between days 9 and 11 post infection (pi) in 58.3% of the infected ewes. Classically, abortions in natural and experimental ovine toxoplasmosis usually occur one month after infection. Few experimental studies have reported the so-called acute phase abortions as early as 7 to 14 days after oral inoculation of oocysts, and pyrexia was proposed to be responsible for abortion, although the underline mechanism was not elucidated. In the present study, all placentas analysed from ewes suffering acute phase abortions showed infarcts and thrombosis in the caruncullar villi of the placentomes and ischemic lesions (periventricular leukomalacia) in the brain of some foetuses. The parasite was identified by PCR in samples from some placentomes of only one sheep, and no antigen was detected by immunohistochemical labelling. These findings suggest that the vascular lesions found in the placenta, and the consequent hypoxic damage to the foetus, could be associated to the occurrence of acute phase abortions. Although the pathogenesis of these lesions remains to be determined, the infectious dose or virulence of the isolate may play a role in their development.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Julio Benavides
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Grulleros, 24346 León, Spain.
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Ferreras MC, González-Lanza C, Pérez V, Fuertes M, Benavides J, Mezo M, González-Warleta M, Giráldez J, Martínez-Ibeas AM, Delgado L, Fernández M, Manga-González MY. Calicophoron daubneyi (Paramphistomidae) in slaughtered cattle in Castilla y León (Spain). Vet Parasitol 2014; 199:268-71. [DOI: 10.1016/j.vetpar.2013.10.019] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 10/23/2013] [Accepted: 10/27/2013] [Indexed: 11/26/2022]
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Martínez-Ibeas A, Perteguer M, González-Lanza C, Gárate T, Manga-González M. Analysis of an expressed sequence tag library from Dicrocoelium dentriticum. Exp Parasitol 2013; 135:287-96. [DOI: 10.1016/j.exppara.2013.07.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 06/17/2013] [Accepted: 07/09/2013] [Indexed: 10/26/2022]
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Martínez-Ibeas A, González-Lanza C, Manga-González M. Proteomic analysis of the tegument and excretory–secretory products of Dicrocoelium dendriticum (Digenea) adult worms. Exp Parasitol 2013; 133:411-20. [DOI: 10.1016/j.exppara.2013.01.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Revised: 12/20/2012] [Accepted: 01/10/2013] [Indexed: 11/29/2022]
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Martínez-Ibeas AM, González-Warleta M, Martínez-Valladares M, Castro-Hermida JA, González-Lanza C, Miñambres B, Ferreras C, Mezo M, Manga-González MY. Development and validation of a mtDNA multiplex PCR for identification and discrimination of Calicophoron daubneyi and Fasciola hepatica in the Galba truncatula snail. Vet Parasitol 2013; 195:57-64. [PMID: 23333073 DOI: 10.1016/j.vetpar.2012.12.048] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Revised: 10/15/2012] [Accepted: 12/20/2012] [Indexed: 11/16/2022]
Abstract
Paramphistomosis and Fasciolosis caused by Calicophoron daubneyi and Fasciola hepatica, respectively, are frequent and important trematodoses in ruminant livestock worldwide. Both parasites use the same snail, Galba truncatula, as intermediate host. The aim of this study was to develop and validate an analytical method based on a mitochondrial DNA (mtDNA) multiplex PCR technique which would allow the early and specific identification, in one step, of C. daubneyi and F. hepatica infection in G. truncatula. First of all, a 1035 bp fragment of mtDNA from adult C. daubneyi worms was obtained. Then two pairs of specific mtDNA primers, which amplified a DNA fragment of 885 pb in the case of C. daubneyi, and of 425 pb in that of F. hepatica, were designed. By means of the multiplex PCR technique developed, there was always a specific amplification in samples from adult F. hepatica and C. daubneyi, but not from Calicophoron calicophorum, Cotylophoron cotylophorum, Cotylophoron batycotyle or Dicrocoelium dendriticum. Likewise, specific amplifications of the expected DNA fragments happened in all samples from snails harbouring larval stages of C. daubneyi or F. hepatica, previously detected by microscopy. However, amplifications were not seen when DNA from snails harbouring other Digenea (Plagiorchiidae, Notocotylidae and furcocercous cercariae) was analysed. Moreover, DNA from G. truncatula molluscs free from infection was not amplified. The multiplex PCR assay permitted infection in the snails experimentally infected with 4 miracidia to be detected as early as day 1 p.i. in the case of F. hepatica and with only 2 miracidia from day 2 p.i. in both, C. daubneyi and F. hepatica. Nevertheless it was necessary to wait until days 29 and 33 p.i. to see C. daubneyi and F. hepatica immature redia, respectively, using microscope techniques. The detection limit of the PCR technique was very low: 0.1 ng of DNA from C. daubneyi and 0.001 ng of DNA from F. hepatica. This allowed infection by either F. hepatica or C. daubneyi to be detected even when pools made up with only 1 μl (60 ng of DNA) from infected snail plus 99 μl from non-infected ones were analyzed. Moreover, simultaneous detection of both parasites was experimentally possible in pools made up with uninfected (98 μl), C. daubneyi infected (1 μl) and F. hepatica infected (1 μl) snails. The most precise and early diagnosis of the infections using the multiplex PCR technique designed will allow more realistic epidemiological models of both infections to be established and consequently a better strategic control.
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Affiliation(s)
- A M Martínez-Ibeas
- Instituto de Ganadería de Montaña, Consejo Superior de Investigaciones Científicas (CSIC) - Universidad de León (ULE), 24346 Grulleros, León, Spain
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Ferreras-Estrada MC, Campo R, González-Lanza C, Pérez V, García-Marín JF, Manga-González MY. Immunohistochemical study of the local immune response in lambs experimentally infected with Dicrocoelium dendriticum (Digenea). Parasitol Res 2007; 101:547-55. [PMID: 17393185 DOI: 10.1007/s00436-007-0511-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [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: 01/19/2007] [Accepted: 02/28/2007] [Indexed: 10/23/2022]
Abstract
Phenotypic expression of inflammatory cells in liver and hepatic lymph nodes (HLN) has been examined in lambs experimentally infected with Dicrocoelium dendriticum using immunohistochemical techniques. Thirty-two lambs, 12 infected with 1,000 D. dendriticum metacercariae, 12 with 3,000, and 8 controls were used. Half the lambs in each group were slaughtered on days 60 and 180 post-infection (p.i.), respectively. Primary antibodies (Abs) against T cell epitopes (CD3+, CD4+, CD8+ and WC1+ gammadelta), B cell epitopes (CD79alphacy+, CD45R+), immunoglobulin (IgG)-bearing plasma cells, macrophages (CD14+, VPM32+) and major histocompatibility complex (MHC) class IIbeta antigen were used. T lymphocytes (CD3+, CD4+ and CD8+) and B lymphocytes (CD79alphacy+ and CD45R+) with diffuse pattern or forming lymphoid aggregates and follicles surrounded the septal bile ducts (SBD) and inter-lobular bile ducts, whereas the WC1 gammadelta T cells were scattered. Numerous IgG+ plasma cells were observed around SBD. CD14 and VPM32+ macrophages intermingled with lymphocytes were immunostained by the anti-MHC class IIbeta. This Ab also reacted with lymphoid cells. Likewise, increased positive immunostaining for all Abs used was observed in the HLN of infected lambs. There was no qualitative difference regarding the phenotype expression of inflammatory cells between the lambs infected with D. dendriticum. The humoral and cell-mediated local immune responses observed were similar in the two groups of lambs infected with different doses.
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Affiliation(s)
- M Carmen Ferreras-Estrada
- Departamento de Sanidad Animal (Histología y Anatomía Patológica), Facultad de Veterinaria, Universidad de León, Campus Universitario de Vegazana, s/n, 24071 Leon, Spain.
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Abstract
AbstractThe transmission, control and the relationship betweenDicrocoelium dendriticumand its definitive (sheep and cattle) and intermediate (molluscs and ants) hosts under natural and experimental conditions are described. Eleven species of molluscs and four of ants were found infected with larvalD. dendriticumin León province, north-west Spain. Infected ants were observed between April and November and in tetania at 7.5–26.9°C. The highest shedding of eggs by sheep and cattle was detected in winter. Two treatments applied in November and January were the most effective. In experimentally infected molluscs, the parasite was not visible under the stereomicroscope, at least until 50 days post-infection (p.i.). The prepatent period in experimentally infected lambs was 49–79 days p.i. The number of eggs per gram increased with the days p.i. and the parasite burden. The aspartate aminotransferase, alanine aminotransferase, gamma-glutamyl transpeptidase, leukocyte and neutrophil values of infected lambs increased, but those of lymphocytes decreased. Using the enzyme-linked immunosorbert assay technique, the IgG antibody response to excretory–secretory and somatic antigens ofD. dendriticumwas positive from day 30 p.i., although the maximum antibody levels were observed on day 60 p.i. The number of worms per lamb ranged between 30 and 2063. Cholangitis and cholangiectasia of the septal bile and hepatic ducts were observed. The best enzymatic systems for adult and larvalD. dendriticumcharacterization were lactate dehydrogenase, glucose phosphate isomerase and phosphoglucomutase. Genetic variability of adultD. dendriticumwas high using the random amplified polymorphic DNA technique.
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Affiliation(s)
- M Y Manga-González
- Departamento de Sistemas de Producción y Sanidad Animal, Estación Agrícola Experimental, Consejo Superior de Investigaciones Científicas, Apartado 788, 24080 León, Spain
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González-Lanza C, Manga-González MY, Revilla-Nuín B. Preliminary protective capacity study of a Dicrocoelium dendriticum antigenic protein in hamsters. Parasitol Res 2006; 99:749-52. [PMID: 16738887 DOI: 10.1007/s00436-006-0230-z] [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: 04/04/2006] [Accepted: 04/26/2006] [Indexed: 10/24/2022]
Abstract
The purpose of this study was to evaluate the protective capacity of 130 kDa Dicrocoelium dendriticum protein in hamsters experimentally infected with this parasite. Forty hamsters divided into four groups of ten animals each were used: G1 (control), G2 (infected), G3 (immunized with Freund's adjuvant and infected), G4 (130 kDa protein vaccinated + adjuvant and infected). Infection with 40 metacercariae/hamster was carried out 4 weeks after the last immunization. Parasitological studies [number of eggs per gram (epg) and worm burden] and biochemical parameters (total proteins, albumin, and total bilirubin), hepatic enzymes [aspartate aminotransferase (AST) and alanine aminotransferase (ALT)], and total IgG levels were determined. A reduction in epg in G3 and G4 was observed 16 weeks postinfection with the higher reduction percentage in the latter (25.2%). No statistically significant differences were detected in the number of recovered worms among groups, although the mean was slightly less in G4 (12.2 +/- 2.08, mean +/- SE) than in G2 (15.4 +/- 2.90). In G4, global protection was 20.9% and an increase in AST and ALT levels was observed. Total IgG levels were similar in the three infected groups. The protection obtained was inadequate, so the antigen dose, immunization-infection period, adjuvants, and immunization route must be optimized.
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Affiliation(s)
- C González-Lanza
- Consejo Superior de Investigaciones Científicas (CSIC), Estación Agrícola Experimental, Grulleros, León 24346, Spain.
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Revilla-Nuín B, Manga-González MY, Miñambres B, González-Lanza C. Partial characterization and isolation of 130kDa antigenic protein of Dicrocoelium dendriticum adults. Vet Parasitol 2005; 134:229-40. [PMID: 16165277 DOI: 10.1016/j.vetpar.2005.07.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [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: 02/08/2005] [Revised: 07/06/2005] [Accepted: 07/21/2005] [Indexed: 11/28/2022]
Abstract
The study focused on characterizing and isolating Dicrocoelium dendriticum antigens or their fractions that could be used for the immunological diagnosis of dicrocoeliosis. Somatic (SoAg) and excretory-secretory antigens (ESAg) were analyzed by SDS-PAGE and their specificity was evaluated by Western blot with homologous and heterologous sera. The antigens were partially purified by chromatographic techniques of gel-filtration (Sephacryl S-300) and ion exchange (Hitrap-DEAE-Sepharose). Western blot analysis using sera of ovine infected with D. dendriticum revealed eight main antigenic polypeptides ranging from 24 to 205 kDa for SoAg and seven for ESAg with apparent molecular mass in the range of 26-205 kDa. We detected a specific parasite protein with an approximate molecular weight of 130 kDa in SDS-PAGE gels, arranged as a 450 kDa tetramer in native conditions. It also showed strong immunoreactivity by Western blot against ovine sera experimentally infected with D. dendriticum. Gel filtration chromatography (Sephacryl S-300) also showed other specific proteins, one of about 24 kDa in SoAg and another of about 42 kDa in ESAg. The elution conditions of 450 kDa protein (130 kDa monomer) by DEAE chromatography were similar to those from the somatic antigen (pH 7.2, 0.1M NaCl, in 29-34 ml fractions) and from the excretion-secretion antigen (pH 8.0, 0.1M NaCl, in 29-35 ml fractions). The suitability of 130 kDa polypeptide for D. dendriticum infection diagnosis was confirmed by Western blot using a pool of sera as well as individual serum samples from experimentally infected sheep. The sequence of amino termini of 130 kDa polypeptide from both fractions was the same and identical to that reported for a peptide from D. dendriticum described as a globin. This sequence also revealed an appreciable similarity with the amino end of globins from some phylogenetically related worms.
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Affiliation(s)
- B Revilla-Nuín
- Departamento de Sistemas de Producción y Sanidad Animal, Estación Agrícola Experimental, Consejo Superior de Investigaciones Científicas CSIC, Aptdo. 788, 24080 León, Spain
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Manga-González MY, Ferreras MC, Campo R, González-Lanza C, Pérez V, García-Marín JF. Hepatic marker enzymes, biochemical parameters and pathological effects in lambs experimentally infected with Dicrocoelium dendriticum (Digenea). Parasitol Res 2004; 93:344-55. [PMID: 15197580 DOI: 10.1007/s00436-004-1128-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [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: 03/15/2004] [Accepted: 03/31/2004] [Indexed: 11/27/2022]
Abstract
Hepatic enzymes and biochemical parameter values were analysed in the sera of 32 lambs: 12 infected with 1,000 Dicrocoelium dendriticum metacercariae, 12 with 3,000 and eight controls. Blood samples were collected at intervals of 30 days from day 0 post-infection (p.i.). Half the lambs in each group were slaughtered on days 60 and 180 p.i, respectively. A histopathological and ultrastructural study was carried out on the liver, gall bladder and hepatic lymph nodes of all animals. A minute increase was detected in the bilirubin (7%) and albumin (3%) values in the infected lambs (with 30-2,063 worms) in comparison with those of the controls. The hepatic enzyme values did increase, above all aspartate aminotransferase (19%) and alanine aminotransferase (22%), mainly in the lambs tested with 3,000 metacercariae (38% and 48%, respectively). The increase was significant 60 days p.i. The severity of the lesions was closely associated with the parasite burden.
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Affiliation(s)
- M Y Manga-González
- Consejo Superior de Investigaciones Científicas (CSIC), Estación Agrícola Experimental, Apdo. 788, 24080 León, Spain.
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Manga-González MY, González-Lanza C, Cabanas E, Campo R. Contributions to and review of dicrocoeliosis, with special reference to the intermediate hosts of Dicrocoelium dendriticum. Parasitology 2002; 123 Suppl:S91-114. [PMID: 11769295 DOI: 10.1017/s0031182001008204] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
An epidemiological study on dicrocoeliosis caused by Dicrocoelium dendriticum was carried out on sheep, molluscs and ants in the mountains of León province (NW Spain) between 1987-1991. The results concerning the intermediate hosts and a review of some aspects of dicrocoeliosis are summarized. Mollusc collection for the helminthological study was random throughout the study area at fortnightly intervals. Twenty-nine Gastropoda species were identified. D. dendriticum infection was only detected in 2.98%, of the 2084 Helicella itala examined and in 1.06% of 852 H. corderoi. The highest infection prevalence was detected in H. itala in September and in H. corderoi in February. Daughter sporocysts with well-developed cercariae predominated in spring and autumn. Infection prevalence increased with mollusc age and size. Ants were collected from anthills or plants to which they were attached. The behaviour of ants in tetania was followed. Twenty-one Formicidae species were identified, but only the following harboured D. dendriticum: Formica cunicularia (1158 examined specimens, 0.69% infection prevalence, 2-56 metacercariae per ant); F. sanguinea (234, 1.28%, 2-63); F. nigricans (1770, 4.97%, 1-186); F. rufibarbis (288, 6.59%, 2-107). In a flat area close to León town, 95.39% of the 2085 F. rufibarbis specimens collected in tetania contained metacercariae (1-240) in the abdomen. These were used for parasite characterization by isoelectric focusing and to infect lambs and hamsters. Only one brainworm per ant was found.
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Affiliation(s)
- M Y Manga-González
- Consejo Superior de Investigaciones Científicas (CSIC), Estación Agrícola Experimental, León, Spain.
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González-Lanza C, Manga-González MY, Campo R, Del-Pozo P, Sandoval H, Oleaga A, Ramajo V. IgG antibody response to ES or somatic antigens of Dicrocoelium dendriticum (Trematoda) in experimentally infected sheep. Parasitol Res 2000; 86:472-9. [PMID: 10894473 DOI: 10.1007/s004360050696] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [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: 11/26/2022]
Abstract
The ELISA technique was used to study the kinetics of IgG antibodies against excretory-secretory (ES) and somatic (So) antigens of Dicrocoelium dendriticum in the sera of 32 lambs: 12 experimentally infected with 1,000 metacercariae, 12 with 3,000 and 8 controls. Both antigen types were used at a 2 microg/ml concentration. Dilutions of sera and the anti-sheep IgG peroxidase conjugate were: 1:200 and 1:6,000, respectively. Optical density values for each type of antigen in the two infected groups were higher than the cut-off point from day 30 post infection (p.i.), showing positive infection. Maximum antibody levels were observed 60 days p.i. and remained high until the experiment ended 180 days p.i. This pattern was similar for both ES and So antigens, although with slightly lower figures in the latter. Antibody kinetics were very similar for each of the two doses, except on day 30 p.i. No correlation between the antibody level and parasite burden could be established.
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Affiliation(s)
- C González-Lanza
- Consejo Superior de Investigaciones Científicas, Estación Agrícola Experimental, León, Spain.
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Campo R, Manga-González MY, González-Lanza C. Relationship between egg output and parasitic burden in lambs experimentally infected with different doses of Dicrocoelium dendriticum (Digenea). Vet Parasitol 2000; 87:139-49. [PMID: 10622605 DOI: 10.1016/s0304-4017(99)00165-x] [Citation(s) in RCA: 35] [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] [Indexed: 10/18/2022]
Abstract
The relationship between egg elimination and parasitic burden was studied in two groups of 12 lambs experimentally infected with 1000 and 3000 Dicrocoelium dendriticum metacercariae, respectively. Half the animals in each group were slaughtered 2 months post-infection (p.i.) and the other half 6 months p.i. In order to detect and follow elimination of D. dendriticum eggs by the lambs, faeces samples collection started one and a half months p.i. and continued fortnightly until the end of the experiment. Egg elimination was first detected between days 49 and 79 p.i. (mean = 59 +/- 1.6 SE). Mean eggs per gram (epg) was higher in the lambs infected with 3000 metacercariae (347.2 +/- 42.4 epg) than in those infected with 1000 (194.8 +/- 14.4), although no significant differences were detected between both groups using the Student 't' test. Egg elimination was higher in the faeces samples taken in the afternoon (mean = 357.8 +/- 47.6 epg) than in those from the morning (mean = 215.7 +/- 21.3). The percentage of metacercariae which became established as worms was higher in the animals dosed with 1000 metacercariae (21.6%) than in those infected with 3000 (16.3%). The number of worms recovered on necropsy of each animal varied between 30 and 2063 (mean = 346.6 +/- 80.5) and their length between 2.6 and 7.1 mm (mean = 5.2 +/- 0.1). The mean number of parasites for lambs infected with 3000 metacercariae (489.3 +/- 163.1) was higher than that obtained from those dosed with 1000 (215.7 +/- 41.4), although more worms were collected in some cases from the lambs infected with the latter dose than the former. In general there was an increase in the number of epg eliminated as days p.i. and parasitic burden increased. A positive relationship was observed via the correlation coefficient between the number of epg eliminated by each of the lambs throughout the experiment and that of worms recovered. This relationship was more intense on considering only the number of epg eliminated between days 120 and 180 p.i.
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Affiliation(s)
- R Campo
- Departamento de Sistemas de Producción y Sanidad Animal, Estación Agrícola Experimental, Consejo Superior de Investigaciones Científicas, León, Spain
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Abstract
Water soluble extracts of 3131 adult specimens of Dicrocoelium dendriticum from cattle, sheep and goats, mainly from León province, were analysed by isoelectric focusing in thin-layer polyacrylamide gels. Activity of the following enzymes was studied: lactate dehydrogenase (LDH, EC 1.1.1.27), glucose phosphate isomerase (GPI, EC 5.3.1.9), phosphoglucomutase (PGM, EC 2.7.5.1), acid phosphatase (AcP, EC 3.1.3.2), alpha-glycerophosphate dehydrogenase (alpha-GPDH, EC 1.1.1.8), hydroxybutyrate dehydrogenase (HBDH, EC 1.1.1.30) and malate dehydrogenase (MDH, 1.1.1.37). Five distinct enzyme types were recognized for LDH (pH range 6.30-7.13), GPI (pH 6.13-6.80) and PGM (pH 6.20-6.60) whereas AcP showed three different patterns (pH 5.70-5.92). Weak and diffuse activity was detected for MDH (pH 4.8-6.2) and no activity was observed for alpha-GPDH and HBDH. In general, little phenotypic variation was observed between worms recovered from a single host, between those from hosts of the same species and between those from hosts of different species, although some enzyme types were found in some animals but not others. Nevertheless, it must be taken into account that most parasites came from sheep and also from a relatively small area in north-west Spain.
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Affiliation(s)
- R Campo
- Departamento de Sistemas de Producción y Sanidad Animal, Estación Agrícola Experimental, Consejo Superior de Investigaciones Científicas (CSIC), León, Spain
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González-Lanza C, Manga-González MY, Campo R, Del-Pozo MP. Larval development of Dicrocoelium dendriticum in Cernuella (Xeromagna) cespitum arigonis under controlled laboratory conditions. J Helminthol 1997; 71:311-7. [PMID: 9443949 DOI: 10.1017/s0022149x00016126] [Citation(s) in RCA: 9] [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: 02/05/2023]
Abstract
The larval development of Dicrocoelium dendriticum (Digenea: Dicrocoeliidae) in experimentally infected Cernuella (Xeromagna) cespitum arigonis (Schmidt, 1853), a species of mollusc important in the epidemiology of dicrocoeliosis in Spain, has been studied. A total of 948 specimens of this mollusc, distributed in five batches, were tested with individual doses of 50 to 150 parasite eggs, obtained from sheep, after 4 days without food. After infection these molluscs and control specimens were kept in an environmental simulation chamber at 20 degrees C, 50% relative humidity and 7 h of light per day. To detect the parasite, a minimum of six molluscs were examined every 20 days from day 1 post-infection (p.i.). The eggs of D. dendriticum were eliminated in the molluscan faeces 48 h post infection. The percentages of molluscs harbouring the parasite ranged between 17.53% and 75%. Daughter sporocysts with undifferentiated germinal masses and occupying very reduced areas of the hepatopancreas were observed 50 days p.i. and in the period immediately following. After 110 days p.i. sporocysts with cercariae at different stages of development were found although slimeball emission was never observed.
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Affiliation(s)
- C González-Lanza
- Departamento de Sistemas de Producción y Sanidad Animal, Estación Agrícola Experimental, Consejo Superior de Investigaciones Científicas (CSIC), Aptdo 788, 24080 León, Spain
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Manga-González Y, González-Lanza C, Kanev I. Lymnaea truncatula, intermediate host of some Plagiorchiidae and Notocotylidae species in León, nw Spain. J Helminthol 1994; 68:135-41. [PMID: 7930455 DOI: 10.1017/s0022149x00013663] [Citation(s) in RCA: 12] [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: 01/27/2023]
Abstract
To study the distribution of Lymnaea truncatula in the Porma river basin (León, NW Spain) and its helminth fauna, malacological samplings were carried out at 66 points in the basin and the presence of these molluscs was detected in 31. To trace the dynamics of this mollusc population and the prevalence and intensity of its infection by trematodes, malacological samplings were made at fortnightly intervals over two years at five locations, situated in the upper and middle regions of the river Porma basin. To confirm the identity of the larval stages found in the molluscs, second intermediate and/or definitive hosts, depending on the trematode species, were experimentally infected to complete the life cycles. Two different species of Plagiorchiidae and one of Notocotylidae were identified. The infection prevalence of Plagiorchis elegans for the 6291 specimens of L. truncatula examined was 2.8% and infection was observed in snails collected in 7 of the 31 sample localities. This parasite was found in all months of the year, with the highest prevalence observed in July and October. When the corrected frequency values were considered, a slightly positive relationship was observed between the infection prevalence and the latter months. The highest percentages of snails harbouring immature sporocysts were detected in March and June-July, while the highest percentages with sporocysts containing mature cercariae were observed in spring and at the end of summer-autumn, and cercarial shedding in the latter. Of the 6291 L. truncatula examined 0.3% were infected by sporocysts of Opisthioglyphe ranae.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- Y Manga-González
- Unidad Estructural de Parasitología Animal, Estación Agrícola Experimental, Consejo Superior de Investigaciones Científicas (CSIC), León, Spain
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Rodríguez-Osorio M, Gómez-García V, Rojas-González J, Ramajo-Martín V, Manga-González MY, González-Lanza C. Resistance to Schistosoma bovis in sheep induced by an experimental Fasciola hepatica infection. J Parasitol 1993; 79:223-5. [PMID: 8459332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Sheep infected with Fasciola hepatica for 10 wk acquired a substantial level of resistance to challenge with Schistosoma bovis. The worm burden was reduced by 87.2% (P < 0.01) compared with that of a control group. But when sheep primarily were infected with S. bovis and 6 wk later with F. hepatica, no significant reduction in the S. bovis burden was observed.
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Affiliation(s)
- M Rodríguez-Osorio
- Department of Immunology, Instituto López Neyra de Parasitologia, Granada, Spain
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Rodríguez-Osorio M, Gómez-García V, Rojas-González J, Ramajo-Martin V, Manga-González MY, González-Lanza C, Rodriguez-Osorio M, Gomez-Garcia V, Rojas-Gonzalez J, Manga-Gonzalez MY, Gonzalez-Lanza C. Resistance to Schistosoma bovis in Sheep Induced by an Experimental Fasciola hepatica Infection. J Parasitol 1993. [DOI: 10.2307/3283511] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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González-Lanza C, Manga-González MY, Del-Pozo-Carnero P. Coprological study of the Dicrocoelium dendriticum (Digenea) egg elimination by cattle in highland areas in León Province, northwest Spain. Parasitol Res 1993; 79:488-91. [PMID: 8415564 DOI: 10.1007/bf00931589] [Citation(s) in RCA: 23] [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] [Indexed: 01/30/2023]
Abstract
Dicrocoelium dendriticum egg output in cattle from five locations of the Porma river basin (León Province, Northwest Spain) was studied at monthly intervals between March 1986 and March 1987. We found D. dendriticum eggs in 37.64% of the 1251 samples examined, and the number of eggs per gram (epg) ranged from 10 to 1000 (average, 41.65 +/- 2.73). The main egg-elimination period, for prevalence, was autumn-winter. The average epg values were quite similar during all months except March, when the maximum was detected. The infection prevalence increased in cattle aged up to 2 years and then a slight, gradual decrease was observed with increasing host age. The average epg values ranged from 40.08 +/- 3.24 to 48.33 +/- 12.42 in all age groups except the oldest animals, for which the figures were lower. The rate of egg elimination was higher in animals that came from locations situated at a greater altitude.
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Affiliation(s)
- C González-Lanza
- Unidad Estructural de Parasitología Animal, Consejo Superior de Investigaciones Científicas (CSIC), León, Spain
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González-Lanza C, Alvarez-Pellitero P, Sitjá-Bobadilla A. Diplectanidae (Monogenea) infestations of sea bass, Dicentrarchus labrax (L.), from the Spanish Mediterranean area. Histopathology and population dynamics under culture conditions. Parasitol Res 1991; 77:307-14. [PMID: 1866420 DOI: 10.1007/bf00930906] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [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: 12/29/2022]
Abstract
In the present study, Diplectanum laubieri was redescribed from material obtained from wild and cultured fish. The population dynamics of D. aequans and D. laubieri under culture conditions was studied. The prevalence and mean intensity (average number of worms per parasitized fish) were 80.64% and 112 for D. aequans and 67.74% and 59.61 for D. laubieri, respectively. Both Diplectanidae exhibited seasonal variations, with maximal infection levels occurring in winter, suggesting continuous parasites recruitment, and infection levels tended to increase with host age. Male hosts were more heavily infested than females. The apparent positive association between D. aequans and D. laubieri was not confirmed statistically. The Diplectanidae showed definite and different patterns of gill distribution. Histopathological gill damage mainly consisted of hyperplasia of the epithelium, fusion of branchial lamellae and the presence of hemorrhagic and inflammatory foci with leucocytic infiltration. The results demonstrated the pathological importance of both Diplectanidae for the cultivation of sea bass.
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Affiliation(s)
- C González-Lanza
- Instituto de Acuicultura Torre de la Sal (CSIC), Ribera de Cabanes, Castellón, Spain
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