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Luz IS, Miagostovich MP. Evaluation of heat treatment for inactivation of norovirus genogroup II in foods. Braz J Microbiol 2022; 53:1159-1165. [PMID: 35312990 PMCID: PMC9433490 DOI: 10.1007/s42770-022-00731-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 03/09/2022] [Indexed: 11/02/2022] Open
Abstract
The effective food processing technology is a key step in eliminating human noroviruses in foods mainly due to their stability in diverse environmental conditions. The aim of this study was to evaluate the effect of rising temperatures for inactivation of norovirus genogroup (G) II and murine norovirus 1 in samples of tomato sauce (72-74 °C for 1 min) and ground meat (100 °C for 30 min). Spiking experiments were carried out in triplicate using TRIzol® reagent method associated with quantitative polymerase chain reaction (qPCR) TaqMan™ system combined with previous free RNA digestion. Success rate and efficiency recoveries of both viruses as well limit of detection of a method for each matrix were also conducted. The heat treatment applied here proved to be efficient to reduce the burden of norovirus GII in a range of 1-4 log10 genomic copies per gram (percentage ranging from 0.45 to 104.54%) in both matrices. The experiments in this study showed that the results of norovirus GII and murine norovirus 1 in tomato sauce and ground meat tested during thermal treatments cannot be generalized to other food matrices, since there may be food-specific protective effects, as the presence of different components, that can interfere in virus inactivation. Studies using different food matrices reinforce the importance to investigate viruses' inactivation thermal processes in foods due to the resistance of these viruses to adverse conditions, contributing to food security in food virology.
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Affiliation(s)
- Isabelle S Luz
- Laboratory of Comparative and Environmental Virology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation/FIOCRUZ, Rio de Janeiro, 21040-360, Brazil.
| | - Marize P Miagostovich
- Laboratory of Comparative and Environmental Virology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation/FIOCRUZ, Rio de Janeiro, 21040-360, Brazil
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Amarasiri M, Utagawa E, Sano D, Katayama K. Identification of novel norovirus polymerase genotypes from pediatric fecal samples collected between the year 1997 and 2000 in Japan. INFECTION GENETICS AND EVOLUTION 2020; 82:104313. [PMID: 32259662 DOI: 10.1016/j.meegid.2020.104313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 03/12/2020] [Accepted: 04/01/2020] [Indexed: 11/24/2022]
Abstract
We analyzed 46 pediatric fecal samples collected between the years 1997 and 2000 to retrospectively evaluate the norovirus strains circulating during that era and to identify possible re-emergence patterns. From the tested fecal samples, we detected GII.1, GII.3, GII.4 (95/96-US) and GII.6 strains. Most importantly, two novel polymerase genotypes (GI.PNA4 and GII.PNA7) were detected during the study. Two possible recombinant strains (GII.6[P7] and GII.3[P29]) were identified and SimPlot analysis confirmed that GII.6[P7] is a recombinant strain. The study emphasizes the importance of retrospective evaluation of human fecal samples in obtaining a better understanding of norovirus circulation, re-emergence and evolution.
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Affiliation(s)
- Mohan Amarasiri
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Aoba 6-6-06, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
| | - Etsuko Utagawa
- National Institute of Infectious Diseases, Gakuen 4-7-1, Musashi-murayama, Tokyo 208-0011, Japan.
| | - Daisuke Sano
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Aoba 6-6-06, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan; Department of Frontier Science for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, Aoba 6-6-06, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
| | - Kazuhiko Katayama
- Laboratory of Viral Infection I, Department of Infection Control and Immunology, Kitasato Institute for Life Sciences and Graduate School of Infection Control Sciences, Kitasato University, Tokyo, Japan
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3
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Lyoo KS, Jung MC, Yoon SW, Kim HK, Jeong DG. Identification of canine norovirus in dogs in South Korea. BMC Vet Res 2018; 14:413. [PMID: 30577780 PMCID: PMC6302410 DOI: 10.1186/s12917-018-1723-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 11/29/2018] [Indexed: 11/19/2022] Open
Abstract
Background Canine noroviruses (CaNoVs) are classified into genogroups GIV, GVI, and GVII and have been detected in fecal samples from dogs since their first appearance in a dog with enteritis in Italy in 2007. CaNoVs may be a public health concern because pet animals are an integral part of the family and could be a potential reservoir of zoonotic agents. Nonetheless, there was no previous information concerning the epidemiology of CaNoV in South Korea. In the present study, we aimed to detect CaNoV antigens and to investigate serological response against CaNoV in dogs. Results In total, 459 fecal samples and 427 sera were collected from small animal clinics and animal shelters housing free-roaming dogs in geographically distinct areas in South Korea. For the detection of CaNoV, RT-PCR was performed using target specific primers, and nucleotide sequences of CaNoV isolates were phylogenetically analyzed. Seroprevalence was performed by ELISA based on P domain protein. CaNoVs were detected in dog fecal samples (14/459, 3.1%) and were phylogenetically classified into the same cluster as previously reported genogroup GIV CaNoVs. Seroprevalence was performed, and 68 (15.9%) of 427 total dog serum samples tested positive for CaNoV IgG antibodies. Conclusion This is the first study identifying CaNoV in the South Korean dog population.
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Affiliation(s)
- Kwang-Soo Lyoo
- Korea Zoonosis Research Institute, Chonbuk National University, Iksan, South Korea
| | - Min-Chul Jung
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, South Korea.,University of Science and Technology (UST), Daejeon, South Korea
| | - Sun-Woo Yoon
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, South Korea
| | - Hye Kwon Kim
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, South Korea
| | - Dae Gwin Jeong
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, South Korea. .,University of Science and Technology (UST), Daejeon, South Korea.
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da Silva Luz I, Miagostovich MP. Comparison of viral elution-concentration methods for recovering noroviruses from deli meats. J Virol Methods 2018; 260:49-55. [DOI: 10.1016/j.jviromet.2018.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 07/02/2018] [Accepted: 07/02/2018] [Indexed: 12/31/2022]
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Seo DJ, Choi C. Inhibition of Murine Norovirus and Feline Calicivirus by Edible Herbal Extracts. FOOD AND ENVIRONMENTAL VIROLOGY 2017; 9:35-44. [PMID: 27807684 DOI: 10.1007/s12560-016-9269-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 10/25/2016] [Indexed: 06/06/2023]
Abstract
Human noroviruses (HuNoVs) cause foodborne and waterborne viral gastroenteritis worldwide. Because HuNoV culture systems have not been developed thus far, no available medicines or vaccines preventing infection with HuNoVs exist. Some herbal extracts were considered as phytomedicines because of their bioactive components. In this study, the inhibitory effects of 29 edible herbal extracts against the norovirus surrogates murine norovirus (MNV) and feline calicivirus (FCV) were examined. FCV was significantly inhibited to 86.89 ± 2.01 and 48.71 ± 7.38% by 100 μg/mL of Camellia sinensis and Ficus carica, respectively. Similarly, ribavirin at a concentration of 100 μM significantly reduced the titer of FCV by 77.69 ± 10.40%. Pleuropterus multiflorus (20 μg/mL) showed antiviral activity of 53.33 ± 5.77, and 50.00 ± 16.67% inhibition was observed after treatment with 20 μg/mL of Alnus japonica. MNV was inhibited with ribavirin by 59.22 ± 16.28% at a concentration of 100 μM. Interestingly, MNV was significantly inhibited with 150 µg/mL Inonotus obliquus and 50 μg/mL Crataegus pinnatifida by 91.67 ± 5.05 and 57.66 ± 3.36%, respectively. Treatment with 20 µg/mL Coriandrum sativum slightly reduced MNV by 45.24 ± 4.12%. The seven herbal extracts of C. sinensis, F. carica, P. multiflorus, A. japonica, I. obliquus, C. pinnatifida, and C. sativum may have the potential to control noroviruses without cytotoxicity.
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Affiliation(s)
- Dong Joo Seo
- Department of Food and Nutrition, College of Biotechnology and Natural Resources, Chung-Ang University, Anseong, Gyeonggi, 17546, South Korea
| | - Changsun Choi
- Department of Food and Nutrition, College of Biotechnology and Natural Resources, Chung-Ang University, Anseong, Gyeonggi, 17546, South Korea.
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Di Martino B, Di Profio F, Ceci C, Di Felice E, Green KY, Bok K, De Grazia S, Giammanco GM, Massirio I, Lorusso E, Buonavoglia C, Marsilio F, Martella V. Seroprevalence of norovirus genogroup IV antibodies among humans, Italy, 2010-2011. Emerg Infect Dis 2015; 20:1828-32. [PMID: 25340375 PMCID: PMC4214292 DOI: 10.3201/eid2011.131601] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Antibodies specific to genogroup IV identified in human specimens suggest zoonotic exposure. Noroviruses (NoVs) of genogroup IV (GIV) (Alphatron-like) cause infections in humans and in carnivorous animals such as dogs and cats. We screened an age-stratified collection of serum samples from 535 humans in Italy, using virus-like particles of genotypes GIV.1, circulating in humans, and GIV.2, identified in animals, in ELISA, in order to investigate the prevalence of GIV NoV-specific IgG antibodies. Antibodies specific for both genotypes were detected, ranging from a prevalence of 6.6% to 44.8% for GIV.1 and from 6.8% to 15.1% for GIV.2 among different age groups. These data are consistent with a higher prevalence of GIV.1 strains in the human population. Analysis of antibodies against GIV.2 suggests zoonotic transmission of animal NoVs, likely attributable to interaction between humans and domestic pets. This finding, and recent documentation of human transmission of NoVs to dogs, indicate the possibility of an evolutionary relationship between human and animal NoVs.
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Mathew LG, Herbst-Kralovetz MM, Mason HS. Norovirus Narita 104 virus-like particles expressed in Nicotiana benthamiana induce serum and mucosal immune responses. BIOMED RESEARCH INTERNATIONAL 2014; 2014:807539. [PMID: 24949472 PMCID: PMC4037605 DOI: 10.1155/2014/807539] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2013] [Accepted: 04/07/2014] [Indexed: 01/03/2023]
Abstract
Narita 104 virus is a human pathogen belonging to the norovirus (family Caliciviridae) genogroup II. Noroviruses cause epidemic gastroenteritis worldwide. To explore the potential of developing a plant-based vaccine, a plant optimized gene encoding Narita 104 virus capsid protein (NaVCP) was expressed transiently in Nicotiana benthamiana using a tobacco mosaic virus expression system. NaVCP accumulated up to approximately 0.3 mg/g fresh weight of leaf at 4 days postinfection. Initiation of hypersensitive response-like symptoms followed by tissue necrosis necessitated a brief infection time and was a significant factor limiting expression. Transmission electron microscopy of plant-derived NaVCP confirmed the presence of fully assembled virus-like particles (VLPs). In this study, an optimized method to express and partially purify NaVCP is described. Further, partially purified NaVCP was used to immunize mice by intranasal delivery and generated significant mucosal and serum antibody responses. Thus, plant-derived Narita 104 VLPs have potential for use as a candidate subunit vaccine or as a component of a multivalent subunit vaccine, along with other genotype-specific plant-derived VLPs.
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Affiliation(s)
- Lolita George Mathew
- Center for Infectious Diseases and Vaccinology (CIDV), The Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, AZ 85287, USA
- The School of Life Sciences, 1001 South McAllister Avenue, Tempe, AZ 85287, USA
| | - Melissa M. Herbst-Kralovetz
- Center for Infectious Diseases and Vaccinology (CIDV), The Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, AZ 85287, USA
- Department of Basic Medical Sciences, University of Arizona College of Medicine-Phoenix, 425 N. 5th Street, Phoenix, AZ 85004, USA
| | - Hugh S. Mason
- Center for Infectious Diseases and Vaccinology (CIDV), The Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, AZ 85287, USA
- The School of Life Sciences, 1001 South McAllister Avenue, Tempe, AZ 85287, USA
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9
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Ifantidou AM, Kachrimanidou M, Markopoulou S, Kansouzidou A, Malisiovas N, Papa A. Molecular epidemiology of noroviruses in Northern Greece, 2005-2006. J Med Virol 2014; 87:170-4. [DOI: 10.1002/jmv.23977] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/15/2014] [Indexed: 11/08/2022]
Affiliation(s)
- Athina M. Ifantidou
- First Department of Microbiology; Aristotle University of Thessaloniki; Medical School; Thessaloniki Greece
| | - Melina Kachrimanidou
- First Department of Microbiology; Aristotle University of Thessaloniki; Medical School; Thessaloniki Greece
| | - Soultana Markopoulou
- First Department of Microbiology; Aristotle University of Thessaloniki; Medical School; Thessaloniki Greece
| | - Athina Kansouzidou
- Department of Microbiology; Infectious Diseases Hospital; Thessaloniki Greece
| | - Nikolaos Malisiovas
- First Department of Microbiology; Aristotle University of Thessaloniki; Medical School; Thessaloniki Greece
| | - Anna Papa
- First Department of Microbiology; Aristotle University of Thessaloniki; Medical School; Thessaloniki Greece
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Sang S, Zhao Z, Suo J, Xing Y, Jia N, Gao Y, Xie L, Du M, Liu B, Ren S, Liu Y. Report of recombinant norovirus GII.g/GII.12 in Beijing, China. PLoS One 2014; 9:e88210. [PMID: 24505432 PMCID: PMC3914918 DOI: 10.1371/journal.pone.0088210] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Accepted: 01/08/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Norovirus (NoV) has been recognized as the most important cause of nonbacterial acute gastroenteritis affecting all age group people in the world. Genetic recombination is a common occurance in RNA viruses and many recombinant NoV strains have been described since it was first reported in 1997. However, the knowledge of recombinant NoV in China is extremely limited. METHODS A total of 685 stool specimens were tested for NoV infection from the acute gastroenteritis patients who visited one general hospital in Beijing from April 2009 to November 2011. The virus recombination was identified by constructing phylogenetic trees of two genes, further SimPlot and the maximum chi-square analysis. RESULTS The overall positive rate was 9.6% (66/685). GII.4 New Orleans 2009 and GII.4 2006b variants were the dominant genotype. Four GII.g/GII.12 and one GII.12/GII.3 recombinant strains were confirmed, and all derived from adult outpatients. The predictive recombination point occurred at the open reading frame (ORF)1/ORF2 overlap. CONCLUSIONS The GII.g ORF1/GII.12ORF2 recombinant has been reported in several countries and it was the first report of this recombinant in China.
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Affiliation(s)
- Shaowei Sang
- Department of Epidemiology and Health Statistics, School of Public Health, Shandong University, Ji'nan, Shandong, China,
- Department of Infection Management and Disease Control, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Zhongtang Zhao
- Department of Epidemiology and Health Statistics, School of Public Health, Shandong University, Ji'nan, Shandong, China,
| | - Jijiang Suo
- Department of Infection Management and Disease Control, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Yubin Xing
- Department of Infection Management and Disease Control, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Ning Jia
- Department of Infection Management and Disease Control, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Yan Gao
- Department of Infection Management and Disease Control, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Lijun Xie
- Department of Infection Management and Disease Control, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Mingmei Du
- Department of Infection Management and Disease Control, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Bowei Liu
- Department of Infection Management and Disease Control, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Shiwang Ren
- Department of Infection Management and Disease Control, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Yunxi Liu
- Department of Infection Management and Disease Control, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
- * E-mail:
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Hoa Tran TN, Trainor E, Nakagomi T, Cunliffe NA, Nakagomi O. Molecular epidemiology of noroviruses associated with acute sporadic gastroenteritis in children: global distribution of genogroups, genotypes and GII.4 variants. J Clin Virol 2012; 56:185-93. [PMID: 23218993 DOI: 10.1016/j.jcv.2012.11.011] [Citation(s) in RCA: 208] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Revised: 11/07/2012] [Accepted: 11/13/2012] [Indexed: 12/22/2022]
Abstract
Noroviruses are a leading cause of epidemic and sporadic acute gastroenteritis worldwide. The development of sensitive molecular diagnostic techniques has revolutionized our understanding of norovirus epidemiology over the past two decades, but norovirus strain types associated with sporadic gastroenteritis remain poorly described. Therefore, we conducted a systematic review of studies performed after 2000 to clarify the genotypic distribution of noroviruses in children (≤18 years of age) with sporadic acute gastroenteritis. Genogroup GII norovirus was the most prevalent, accounting for 96% of all sporadic infections. GII.4 was the most prevalent genotype, accounting for 70% of the capsid genotypes and 60% of the polymerase genotypes, followed by the capsid genotype GII.3 (16%) and the polymerase genotype GII.b (14%). The most common ORF1/ORF2 inter-genotype recombinants were GII.b, GII.12, and GII.4 polymerase genotypes combined with the capsid genotype GII.3, accounting for 19% of all genotyped strains. The distribution of GII.4 variants over the last decade was dominated by successive circulation of GII.4/2002, GII.4/2004, GII.4/2006b, and GII.4/2008 with GII.4/2006b continuing to date. Genotypes GII.4 and GII.3 have predominated in children during the past decade; this is most notable in the global emergence of GII.4 variant noroviruses. As the burden of rotavirus disease decreases following the introduction of childhood immunization programs, the relative importance of norovirus in the etiology of acute childhood gastroenteritis will likely increase. In order for a successful norovirus vaccine to be developed, it should provide immunity against strains with capsid genotypes GII.4 and GII.3.
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Affiliation(s)
- T N Hoa Tran
- Department of Molecular Microbiology and Immunology, Graduate School of Biomedical Sciences, The Global Center of Excellence, Nagasaki University, Nagasaki, Japan
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Morillo SG, Timenetsky MDCST. Norovirus: an overview. Rev Assoc Med Bras (1992) 2012; 57:453-8. [PMID: 21876931 DOI: 10.1590/s0104-42302011000400023] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Accepted: 05/01/2011] [Indexed: 11/22/2022] Open
Abstract
Although noroviruses (NoVs) were the first viral agents linked to gastrointestinal disease, for a long time they have been considered secondary cause of gastroenteritis, second to rotaviruses as etiologic agents. The development of molecular techniques in diagnosing NoV provided a clearer insight into the epidemiological impact of these viruses, which are currently recognized not only as the leading cause of non-bacterial gastroenteritis outbreaks, but also as a major cause of sporadic gastroenteritis in both children and adults. This review focuses on the required knowledge to understand their morphology, genetics, transmission, pathogenesis, and control. Since no vaccine is available, prevention of NoV infection relies mainly on strict community and personal hygiene measures.
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Marked genomic diversity of norovirus genogroup I strains in a waterborne outbreak. Appl Environ Microbiol 2012; 78:1846-52. [PMID: 22247153 DOI: 10.1128/aem.07350-11] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Marked norovirus (NoV) diversity was detected in patient samples from a large community outbreak of gastroenteritis with waterborne epidemiology affecting approximately 2,400 people. NoV was detected in 33 of 50 patient samples examined by group-specific real-time reverse transcription-PCR. NoV genotype I (GI) strains predominated in 31 patients, with mixed GI infections occurring in 5 of these patients. Sequence analysis of RNA-dependent polymerase-N/S capsid-coding regions (∼900 nucleotides in length) confirmed the dominance of the GI strains (n = 36). Strains of NoV GI.4 (n = 21) and GI.7 (n = 9) were identified, but six strains required full capsid amino acid analyses (530 to 550 amino acids) based on control sequencing of cloned amplicons before the virus genotype could be determined. Three strains were assigned to a new NoV GI genotype, proposed as GI.9, based on capsid amino acid analyses showing 26% dissimilarity from the established genotypes GI.1 to GI.8. Three other strains grouped in a sub-branch of GI.3 with 13 to 15% amino acid dissimilarity to GI.3 GenBank reference strains. Phylogenetic analysis (2.1 kb) of 10 representative strains confirmed these genotype clusters. Strains of NoV GII.4 (n = 1), NoV GII.6 (n = 2), sapovirus GII.2 (n = 1), rotavirus (n = 3), adenovirus (n = 1), and Campylobacter spp. (n = 2) were detected as single infections or as mixtures with NoV GI. Marked NoV GI diversity detected in patients was consistent with epidemiologic evidence of waterborne NoV infections, suggesting human fecal contamination of the water supply. Recognition of NoV diversity in a cluster of patients provided a useful warning marker of waterborne contamination in the Lilla Edet outbreak.
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15
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Scientific Opinion on an update on the present knowledge on the occurrence and control of foodborne viruses. EFSA J 2011; 9:2190. [PMID: 32313582 PMCID: PMC7163696 DOI: 10.2903/j.efsa.2011.2190] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
A review of the biology, epidemiology, diagnosis and public health importance of foodborne viruses was performed. Data needs to support a risk assessment were also identified. In addition possible control options and their anticipated impact to prevent or reduce the number of foodborne viral human infections were identified, including the scientific reasons for and against the establishment of food safety criteria and process hygiene criteria for viruses for certain food categories. Food may be contaminated by virus during all stages of the food supply chain, and transmission can occur by consumption of food contaminated during the production process (primary production, or during further processing), or contaminated by infected food handlers. Transmission of zoonotic viruses (e.g. HEV) can also occur by consumption of products of animal origin. Viruses do not multiply in foods, but may persist for extended periods of time as infectious particles in the environment, or in foods. At the EU-level it is unknown how much viral disease can be attributed to foodborne spread. The relative contribution of different sources (shellfish, fresh produce, food handler including asymptomatic shedders, food handling environment) to foodborne illness has not been determined. The Panel recommends focusing controls on preventive measures to avoid viral contamination rather than trying to remove/inactivate these viruses from food. Also, it is recommended to introduce a microbiological criteria for viruses in bivalve molluscs, unless they are labelled "to be cooked before consumption". The criteria could be used by food business operators to validate their control options. Furthermore, it is recommended to refine the regulatory standards and monitoring approaches in order to improve public health protection. Introduction of virus microbiological criteria for classification of bivalve molluscs production areas should be considered. A virus monitoring programme for compliance with these criteria should be risk based according to the findings of a sanitary survey.
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Di Martino B, Martella V, Di Profio F, Ceci C, Marsilio F. Detection of St-Valerien-like viruses in swine, Italy. Vet Microbiol 2010; 149:221-4. [PMID: 21115307 DOI: 10.1016/j.vetmic.2010.10.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Revised: 10/01/2010] [Accepted: 10/08/2010] [Indexed: 10/18/2022]
Abstract
St-Valerien-like viruses are newly recognized porcine caliciviruses recently detected in Canadian swine farms. These viruses that appeared genetically closest to the Tulane non-human primate virus and noroviruses (NoVs), may represent members of a potential new genera within the Caliciviridae family. To date, there are no information on the epidemiology of these novel caliciviruses in other continents. In this study, 264 faecal samples collected from asymptomatic adult pigs were screened by RT-PCR using St-Valerien-like specific primers. Porcine caliciviruses, resembling St-Valerien-like viruses were identified in five animals. The 3' end of the genome of one of these strains, 25A/ITA, was determined, revealing close genetic relatedness to the newly discovered St-Valerien-like caliciviruses, identified in swine in Canada. The findings of this investigation demonstrate that St-Valerien-like viruses are not geographically restricted, since they were identified outside the North American continent where there were first signalled.
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Affiliation(s)
- Barbara Di Martino
- Department of Scienze Biomediche Comparate, University of Teramo, Teramo, Italy.
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Frequent detection of noroviruses and sapoviruses in swine and high genetic diversity of porcine sapovirus in Japan during Fiscal Year 2008. J Clin Microbiol 2010; 48:1215-22. [PMID: 20164276 DOI: 10.1128/jcm.02130-09] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A molecular biological survey on porcine norovirus (NoV) and sapovirus (SaV) was conducted in Toyama Prefecture, Japan, during fiscal year 2008. Both NoV and SaV were detected from swine fecal samples throughout the surveillance period, indicating that these viruses were circulating in this region. NoV strains detected in this study belonged to three genotypes that are known as typical swine NoVs. Although human NoVs were occasionally detected, it was unclear whether they replicated in pigs. As for SaV, genogroup VII (GVII) and other divergent genogroups were identified in addition to the dominant genogroup, GIII, which is the prototypic porcine SaV. In addition, 3 strains genetically related to human SaV were detected. Two of these 3 strains were closely related to human SaV GV. Our study showed that genetic diversification of porcine SaV is currently progressing in the swine population.
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Detection and characterization of porcine sapoviruses from asymptomatic animals in Irish farms. Vet Microbiol 2009; 139:176-82. [DOI: 10.1016/j.vetmic.2009.05.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 05/01/2009] [Accepted: 05/28/2009] [Indexed: 11/21/2022]
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19
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Mouse norovirus replication is associated with virus-induced vesicle clusters originating from membranes derived from the secretory pathway. J Virol 2009; 83:9709-19. [PMID: 19587041 DOI: 10.1128/jvi.00600-09] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Human noroviruses (family Caliciviridae) are the leading cause of nonbacterial gastroenteritis worldwide. Despite the prevalence of these viruses within the community, the study of human norovirus has largely been hindered due to the inability to cultivate the viruses ex vivo and the lack of a small-animal model. In 2003, the discovery of a novel murine norovirus (MNV-1) and the identification of the tropism of MNV-1 for cells of a mononuclear origin led to the establishment of the first norovirus tissue culture system. Like other positive-sense RNA viruses, MNV-1 replication is associated with host membranes, which undergo significant rearrangement during infection. We characterize here the subcellular localization of the MNV-1 open reading frame 1 proteins and viral double-stranded RNA (dsRNA). Over the course of infection, dsRNA and the MNV-1 RNA-dependent RNA polymerase (NS7) were observed to proliferate from punctate foci located in the perinuclear region. All of the MNV-1 open reading frame 1 proteins were observed to colocalize with dsRNA during the course of infection. The MNV-1 replication complex was immunolocalized to virus-induced vesicle clusters formed in the cytoplasm of infected cells. Both dsRNA and MNV-1 NS7 were observed to localize to the limiting membrane of the individual clusters by cryo-immunoelectron microscopy. We show that the MNV-1 replication complex initially associates with membranes derived from the endoplasmic reticulum, trans-Golgi apparatus, and endosomes. In addition, we show that MNV-1 replication is insensitive to the fungal metabolite brefeldin A and consistently does not appear to recruit coatomer protein complex I (COPI) or COPII component proteins during replication. These data provide preliminary insights into key aspects of replication of MNV-1, which will potentially further our understanding of the pathogenesis of noroviruses and aid in the identification of potential targets for drug development.
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20
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Morilla SG, Cilli A, de Cássia Compagnoli Carmona R, Timenetsky MDCST. Identification and molecular characterization of norovirus in são paulo state, Brazil. Braz J Microbiol 2008; 39:619-22. [PMID: 24031277 PMCID: PMC3768465 DOI: 10.1590/s1517-83822008000400004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2007] [Revised: 11/22/2007] [Accepted: 06/02/2008] [Indexed: 11/21/2022] Open
Abstract
Norovirus (NoV), previously called Norwalk-like virus, represents an important group of human pathogens associated with outbreaks of nonbacterial gastroenteritis. Epidemiological surveys of outbreaks have shown that the most important routes of transmission are person-to-person contacts and contaminated food and water, with the virus affecting adults and children. NoV is classified into genogroups, being genogroups GI, GII and GIV found in humans. In view of the high genetic diversity of NoV and the lack of information about this virus in Brazil, the aim of the present study was the molecular characterization of NoV isolated from diarrheic stool samples of patients from São Paulo State. In this study, 204 stool specimens collected during diarrhea outbreaks were analyzed by RT-PCR, and 12 were sequenced for genogroup confirmation. One-step PCR was performed in order to amplify the B region of ORF 1 using the MON 431, 432, 433 and 434 primer pool. From total, 32 (15.7%) stool specimens were positive for NoV genogroup GII. Comparison of the sequences of the PCR products to GenBank sequences showed 88.8% to 98.8% identity, suggesting the presence of genogroup GII in gastroenteritis outbreaks in São Paulo State.
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Buesa J, Montava R, Abu-Mallouh R, Fos M, Ribes JM, Bartolomé R, Vanaclocha H, Torner N, Domínguez A. Sequential evolution of genotype GII.4 norovirus variants causing gastroenteritis outbreaks from 2001 to 2006 in Eastern Spain. J Med Virol 2008; 80:1288-95. [PMID: 18461627 DOI: 10.1002/jmv.21182] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Noroviruses are the most common cause of outbreaks of viral gastroenteritis worldwide. Norovirus outbreaks were surveyed in Catalonia and the region of Valencia (Eastern Spain) between January 2001 and December 2006 as part of the European Union funded network "Food-borne viruses in Europe". During this time the etiology and epidemiological features of 194 outbreaks of acute non-bacterial gastroenteritis were investigated and norovirus was identified as causing 169 (87.1%) of them. Molecular epidemiology of viral strains was studied by RT-PCR and sequencing part of the RNA polymerase gene in ORF1 from 153 outbreak strains. The most commonly identified norovirus genotype was GII.4 (71.9% of the characterized outbreak strains), which is also the predominant genotype worldwide. During this survey five genetic variants of GII.4 genotype have been sequentially detected and identified as 1996, 2002, 2004, 2006a, and 2006b variants. The transition from one variant to a new one always took place over a short period of time, and thereafter the replacement of strains circulating previously was observed. These new GII.4 variants may have arisen as a consequence of viral evasion from the host immune responses, although apparently there is a lack of long-term immunity after norovirus infections.
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Affiliation(s)
- Javier Buesa
- Department of Microbiology, School of Medicine, University of Valencia, and Hospital Clínico Universitario, Valencia, Spain.
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22
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Pagotto F, Corneau N, Mattison K, Bidawid S. Development of a DNA microarray for the simultaneous detection and genotyping of noroviruses. J Food Prot 2008; 71:1434-41. [PMID: 18680944 DOI: 10.4315/0362-028x-71.7.1434] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Current methods for detecting and genotyping noroviruses focus on the use of reverse transcriptase (RT)-mediated PCR. A major drawback of this approach is that short target RT-PCR products do not always encompass sequences that can be compared among research laboratories, resulting in difficulties for molecular epidemiology. We describe the use of a microarray-based system for simultaneous detection and molecular characterization of noroviruses. The protocol generates a 917-bp RT-PCR product that encompasses two major regions currently used for detection and analysis of norovirus genomes. The PCR products are then hybridized to an oligonucleotide array (NoroChip) based on 50-mer features, which allows for both confirmation of reaction specificity and molecular characterization of the amplified genome. Parallel sequence analyses of amplicons revealed that our microarray data were robust in separating genogroups I and II, and further subtyping to the cluster level was possible. This approach, combining detection and characterization, overcomes the need for expensive and time-consuming sequence analysis of amplified genome targets for molecular epidemiology.
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Affiliation(s)
- Franco Pagotto
- Microbiology Research Division, Bureau of Microbial Hazards, Food Directorate, Health Products and Food Branch, Health Canada, Sir FG Banting Research Centre, P.L. 2204E, Ottawa, Ontario, Canada.
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23
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Santi L, Batchelor L, Huang Z, Hjelm B, Kilbourne J, Arntzen CJ, Chen Q, Mason HS. An efficient plant viral expression system generating orally immunogenic Norwalk virus-like particles. Vaccine 2008; 26:1846-54. [PMID: 18325641 PMCID: PMC2744496 DOI: 10.1016/j.vaccine.2008.01.053] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2007] [Revised: 01/23/2008] [Accepted: 01/29/2008] [Indexed: 11/20/2022]
Abstract
Virus-like particles (VLPs) derived from enteric pathogens like Norwalk virus (NV) are well suited to study oral immunization. We previously described stable transgenic plants that accumulate recombinant NV-like particles (rNVs) that were orally immunogenic in mice and humans. The transgenic approach suffers from long generation time and modest level of antigen accumulation. We now overcome these constraints with an efficient tobacco mosaic virus (TMV)-derived transient expression system using leaves of Nicotiana benthamiana. We produced properly assembled rNV at 0.8 mg/g leaf 12 days post-infection (dpi). Oral immunization of CD1 mice with 100 or 250 microg/dose of partially purified rNV elicited systemic and mucosal immune responses. We conclude that the plant viral transient expression system provides a robust research tool to generate abundant quantities of rNV as enriched, concentrated VLP preparations that are orally immunogenic.
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Affiliation(s)
- Luca Santi
- The Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ 85287-5401, USA
- Department of Biology, University of Rome “Tor Vergata”, via della Ricerca Scientifica, 1 00133 Rome, Italy
| | - Lance Batchelor
- The Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ 85287-5401, USA
| | - Zhong Huang
- The Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ 85287-5401, USA
| | - Brooke Hjelm
- The Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ 85287-5401, USA
| | - Jacquelyn Kilbourne
- The Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ 85287-5401, USA
| | - Charles J. Arntzen
- The Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ 85287-5401, USA
| | - Qiang Chen
- The Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ 85287-5401, USA
- Department of Applied Biological Sciences, Arizona State University, Mesa, AZ 85212, USA
| | - Hugh S. Mason
- The Biodesign Institute and School of Life Sciences, Arizona State University, Tempe, AZ 85287-5401, USA
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24
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Tracing of norovirus outbreak strains in mussels collected near sewage effluents. Appl Environ Microbiol 2008; 74:2544-9. [PMID: 18310420 DOI: 10.1128/aem.02477-07] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Noroviruses from mussels collected near sewage effluents were compared with local patient outbreak strains. Sequence analyses of RNA polymerase-capsid-poly(A)-3' (3.1-kilobase) regions confirmed the 99.9% similarity between genotype I.1 strains from mussels and patient strains from recreational-bathing outbreaks, indicating the potential usefulness of sentinel norovirus mussel studies in tracing human norovirus contamination of coastal waters.
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25
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Zhu D, Fox GE, Chakravarty S. RECOVIR: An application package to automatically identify some single stranded RNA viruses using capsid protein residues that uniquely distinguish among these viruses. BMC Bioinformatics 2007; 8:379. [PMID: 17927830 PMCID: PMC2174958 DOI: 10.1186/1471-2105-8-379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2007] [Accepted: 10/10/2007] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Most single stranded RNA (ssRNA) viruses mutate rapidly to generate large number of strains having highly divergent capsid sequences. Accurate strain recognition in uncharacterized target capsid sequences is essential for epidemiology, diagnostics, and vaccine development. Strain recognition based on similarity scores between target sequences and sequences of homology matched reference strains is often time consuming and ambiguous. This is especially true if only partial target sequences are available or if different ssRNA virus families are jointly analyzed. In such cases, knowledge of residues that uniquely distinguish among known reference strains is critical for rapid and unambiguous strain identification. Conventional sequence comparisons are unable to identify such capsid residues due to high sequence divergence among the ssRNA virus reference strains. Consequently, automated general methods to reliably identify strains using strain distinguishing residues are not currently available.
Results
We present here RECOVIR ("recognize viruses"), a software tool to automatically detect strains of caliciviruses and picornaviruses by comparing their capsid residues with built-in databases of residues that uniquely distinguish among known reference strains of these viruses. The databases were created by constructing partitioned phylogenetic trees of complete capsid sequences of these viruses. Strains were correctly identified for more than 300 complete and partial target sequences by comparing the database residues with the aligned residues of these sequences. It required about 5 seconds of real time to process each sequence. A Java-based user interface coupled with Perl-coded computational modules ensures high portability of the software. RECOVIR currently runs on Windows XP and Linux platforms. The software generalizes a manual method briefly outlined earlier for human caliciviruses.
Conclusion
This study shows implementation of an automated method to identify virus strains using databases of capsid residues. The method is implemented to detect strains of caliciviruses and picornaviruses, two of the most highly divergent ssRNA virus families, and therefore, especially difficult to identify using a uniform method. It is feasible to incorporate the approach into classification schemes of caliciviruses and picornaviruses and to extend the approach to recognize and classify other ssRNA virus families.
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Abstract
Noroviruses (NVs) are a major cause of acute gastroenteritis epidemics in both developing and developed countries and affect people of all ages. Three main human histo-blood group antigens (HBGAs) – the ABO, Lewis and secretor families – are involved in NV recognition and eight strain-specific receptor-binding patterns in two major binding groups have been described. The receptor-binding interface is located at the outermost surface of the P domain of the viral capsid. Each interface contains two major binding sites and each site interacts with a carbohydrate side-chain of the HBGAs via multiple hydrogen bonds. Soluble HBGAs in human milk are able to block binding of NV to HBGA receptors, suggesting a potential decoy receptor for the protection of infants from NV infection. Phylogenetic analysis has revealed limited genetic relatedness among NVs with similar receptor-binding patterns. This review summarises and discusses recent advances and highlights implications for future studies in the control and prevention of NV gastroenteritis.
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Affiliation(s)
- Ming Tan
- Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 45229-3039, USA
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27
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Radford AD, Coyne KP, Dawson S, Porter CJ, Gaskell RM. Feline calicivirus. Vet Res 2007; 38:319-35. [PMID: 17296159 DOI: 10.1051/vetres:2006056] [Citation(s) in RCA: 150] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2006] [Accepted: 09/25/2006] [Indexed: 11/14/2022] Open
Abstract
Feline calicivirus (FCV) is an important and highly prevalent pathogen of cats. It belongs to the family Caliciviridae which includes other significant pathogens of man and animals. As an RNA virus, high polymerase error rates convey upon FCV a high genome plasticity, and allow the virus to respond rapidly to environmental selection pressures. This makes the virus very adaptable and has important implications for clinical disease and its control. Being genetically diverse, FCV is associated with a range of clinical syndromes from inapparent infections to relatively mild oral and upper respiratory tract disease with or without acute lameness. More recently, highly virulent forms of the virus have emerged associated with a systemic infection that is frequently fatal. A proportion of FCV infected cats that recover from acute disease, remain persistently infected. In such cats, virus evolution is believed to help the virus to evade the host immune response. Such long-term carriers may only represent a minority of the feline population but are likely to be crucial to the epidemiology of the virus. Vaccination against FCV has been available for many years and has effectively reduced the incidence of clinical disease. However, the vaccines do not prevent infection and vaccinated cats can still become persistently infected. In addition, FCV strain variability means that not all strains are protected against equally. Much progress has been made in understanding the biology and pathogenesis of this important feline virus. Challenges for the future will necessarily focus on how to control the variability of this virus particularly in relation to emerging virulent strains and vaccination.
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Affiliation(s)
- Alan D Radford
- University of Liverpool Veterinary Teaching Hospital, Leahurst, Chester High Road, Neston, S. Wirral, CH64 7TE, United Kingdom.
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28
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Wang QH, Costantini V, Saif LJ. Porcine enteric caliciviruses: genetic and antigenic relatedness to human caliciviruses, diagnosis and epidemiology. Vaccine 2006; 25:5453-66. [PMID: 17234307 PMCID: PMC2735111 DOI: 10.1016/j.vaccine.2006.12.032] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2006] [Revised: 11/29/2006] [Accepted: 12/11/2006] [Indexed: 11/17/2022]
Abstract
Porcine enteric caliciviruses include sapoviruses and noroviruses. Porcine sapoviruses infect pigs of all ages and cause diarrhea in young pigs, whereas porcine noroviruses were detected exclusively from adult pigs without clinical signs. Importantly, certain porcine norovirus strains were genetically and antigenically related to human noroviruses. This raises public health concerns that pigs may be reservoirs for emergence of epidemic human norovirus strains. This article reviews the discovery of porcine noroviruses and sapoviruses, their classification, diagnosis, epidemiology and genetic and antigenic relatedness to human caliciviruses.
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Affiliation(s)
- Qiu-Hong Wang
- Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Veronica Costantini
- Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH 44691
| | - Linda J. Saif
- Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Department of Veterinary Preventive Medicine, The Ohio State University, Wooster, OH 44691
- *Corresponding author: Dr. Linda J. Saif, Food Animal Health Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, 1680 Madison Avenue, Wooster, OH 44691; Phone: 330-263-3744; Fax: 330-263-3677; E-mail:
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29
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Okada M, Yamashita Y, Oseto M, Ogawa T, Kaiho I, Shinozaki K. Genetic variability in the sapovirus capsid protein. Virus Genes 2006; 33:157-61. [PMID: 16972029 DOI: 10.1007/s11262-005-0051-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2005] [Revised: 11/15/2005] [Accepted: 11/21/2005] [Indexed: 11/30/2022]
Abstract
Sapovirus (SV), which causes gastroenteritis in humans, is composed of genetically divergent viruses classified into 5 genogroups. In this study, 2.2-kb nucleotide sequences of the 3' terminus of the genome of 15 SV strains detected in Japan were determined. The 15 SV strains could be classified into four genogroups (GI, GII, GIV and GV), and in two of these, GI and GII, 10 genotypes were identified. The amino acid sequences of the central variable region of the capsid protein showed less than 81% identity when strains belonging to different genotypes were compared. It was therefore supposed that antigenic variety exists between different genotypes. These results will be useful for further genetic and antigenic analyses of SV.
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Affiliation(s)
- Mineyuki Okada
- Division of Virology, Chiba Prefectural Institute of Public Health, Chiba-shi, Chiba 260-8715, Japan.
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30
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Affiliation(s)
| | | | - Yan Li
- Kunming Medical College, Kunming, People’s Republic of China
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31
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Tan M, Meller J, Jiang X. C-terminal arginine cluster is essential for receptor binding of norovirus capsid protein. J Virol 2006; 80:7322-31. [PMID: 16840313 PMCID: PMC1563700 DOI: 10.1128/jvi.00233-06] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Noroviruses are the major viral pathogens of epidemic acute gastroenteritis affecting people worldwide. They have been found to recognize human histo-blood group antigens as receptors. The P domain of norovirus capsid protein was found to be responsible for binding to viral receptors, and the recombinant P protein forms P dimers and P particles in vitro. In this study, we demonstrate that a highly conserved arginine (R) cluster at the C terminus of the P domain is critical for receptor binding and P particle formation of the P proteins. Deletions of the R cluster abolished these functions. Replacement of the R cluster with histidines (another positively charged amino acid) resulted in low efficiency of receptor binding and P particle formation, while replacement with alanines led to loss of both functions completely. The R cluster also contains a highly conserved trypsin digestion site. A treatment of capsid protein or P domain mutants from both genogroup I (Norwalk virus) and genogroup II (VA387) noroviruses with trypsin resulted in a removal of the R cluster and the S domain, leaving a P polypeptide of 31.3 kDa (Norwalk virus) or 34.3 kDa (VA387), similar to the soluble P protein found in vivo. Our findings imply that the proteolytic process could be a necessary step for norovirus replication in the host.
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Affiliation(s)
- Ming Tan
- Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039, USA
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32
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Etherington GJ, Ring SM, Charleston MA, Dicks J, Rayward-Smith VJ, Roberts IN. Tracing the origin and co-phylogeny of the caliciviruses. J Gen Virol 2006; 87:1229-1235. [PMID: 16603525 DOI: 10.1099/vir.0.81635-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Caliciviruses infect a wide range of mammalian hosts and include the genus Norovirus, the major cause of food-borne viral gastroenteritis in humans. Using publicly available sequence data and phylogenetic analysis tools, the origins and virus–host co-phylogeny of these viruses were investigated. Here, evidence is presented in support of host switching by caliciviruses, but showing that zoonotic transfer does not appear to have occurred in the history of these viruses. The age or demography of the caliciviruses cannot yet be estimated with any firm degree of support, but further studies of this family, as new dated sequences become available, could provide key information of importance to human health and in understanding the emergence of food-borne disease.
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Affiliation(s)
- Graham J Etherington
- Department of Food Safety Science, Institute of Food Research, Norwich Research Park, Colney Lane, Norwich NR4 7UA, UK
| | - Susan M Ring
- Department of Food Safety Science, Institute of Food Research, Norwich Research Park, Colney Lane, Norwich NR4 7UA, UK
| | - Michael A Charleston
- Evolutionary Biology Group, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
| | - Jo Dicks
- Computational Biology Group, John Innes Centre, Norwich Research Park, Colney Lane, Norwich NR4 7HA, UK
| | - Vic J Rayward-Smith
- School of Computing Sciences, University of East Anglia, Norwich NR4 7TJ, UK
| | - Ian N Roberts
- Department of Food Safety Science, Institute of Food Research, Norwich Research Park, Colney Lane, Norwich NR4 7UA, UK
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33
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Bull RA, Tu ETV, McIver CJ, Rawlinson WD, White PA. Emergence of a new norovirus genotype II.4 variant associated with global outbreaks of gastroenteritis. J Clin Microbiol 2006; 44:327-33. [PMID: 16455879 PMCID: PMC1392656 DOI: 10.1128/jcm.44.2.327-333.2006] [Citation(s) in RCA: 263] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Norovirus (NoV) is highly infectious and is the major cause of outbreak gastroenteritis in adults, with pandemic spread of the virus being reported in 1995 and 2002. The NoV genome is genetically diverse, which has hampered development of sensitive molecular biology-based methods. In this study we report on a nested reverse transcriptase PCR (nRT-PCR) that was designed to amplify the highly conserved 3' end of the polymerase region and the 5' end of the capsid gene of NoV genogroup II (GII). The nRT-PCR was validated with strains isolated from sporadic and outbreak cases between 1997 and 2004 in New South Wales, Australia. Phylogenetic analysis identified six genotypes circulating in New South Wales, GII.1, GII.3, GII.4, GII.6, GII.7, and GII.10, with GII.4 being the predominant genotype. In 2004, there was a marked increase in NoV GII activity in Australia, with a novel GII.4 variant being identified as the etiological agent in 18 outbreaks investigated. This novel GII.4 variant, termed Hunter virus, differed by more than 5% at the amino acid level across the capsid from any other NoV strain in the GenBank and EMBL databases. The Hunter virus was subsequently identified as the etiological agent in large epidemics of gastroenteritis in The Netherlands, Japan, and Taiwan in 2004 and 2005.
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Affiliation(s)
- Rowena A Bull
- School of Biotechnology and Biomolecular Sciences, Faculty of Science, University of New South Wales, Sydney 2052, Australia
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34
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Molecular Virology of Enteric Viruses (with Emphasis on Caliciviruses). VIRUSES IN FOODS 2006:43-100. [PMCID: PMC7120911 DOI: 10.1007/0-387-29251-9_3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
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35
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Tseng FC, Leon JS, MacCormack JN, Maillard JM, Moe CL. Molecular epidemiology of norovirus gastroenteritis outbreaks in North Carolina, United States: 1995–2000. J Med Virol 2006; 79:84-91. [PMID: 17133557 DOI: 10.1002/jmv.20729] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Noroviruses (NoVs) are the most common cause of acute non-bacterial gastroenteritis outbreaks in the US. We investigated 16 gastroenteritis outbreaks in North Carolina (NC), from 1995 to 2000, to further characterize the epidemiology of NoV using RT-PCR on stool and ELISA on sera. NoV were identified in 14 outbreaks by RT-PCR. Sequence analyses of the amplicons indicated the outbreak strains belonged to the following clusters: five GII/4, three GI/3, one GI/4, one GII/2, one GII/5, one GII/7, and one GII/13 (prototype strain). We detected NoV in stool samples from one outbreak but could not determine its specific cluster within the GII genogroup based on polymerase sequence analysis. The five GII/4 strains were classified as the "95/96 US common strain" and occurred throughout the 5-year period. In contrast to national trends, the majority (86%) of NoV outbreaks identified in North Carolina were foodborne. Of the 12 food-related NoV outbreaks, we were able to document transmission by food handlers in two outbreaks. Person-to-person transmission from primary cases was suggested in three outbreaks. Our results indicate that NoVs are important agents of viral gastroenteritis outbreaks in NC.
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Affiliation(s)
- F C Tseng
- Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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36
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Affiliation(s)
- Sagar M. Goyal
- Department of Veterinary Population Medicine, University of Minnesota, 1333 Gortner Avenue, St Paul, MN 55108
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37
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Zheng DP, Ando T, Fankhauser RL, Beard RS, Glass RI, Monroe SS. Norovirus classification and proposed strain nomenclature. Virology 2005; 346:312-23. [PMID: 16343580 DOI: 10.1016/j.virol.2005.11.015] [Citation(s) in RCA: 796] [Impact Index Per Article: 41.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2005] [Revised: 09/21/2005] [Accepted: 11/12/2005] [Indexed: 12/26/2022]
Abstract
Without a virus culture system, genetic analysis becomes the principal method to classify norovirus (NoV) strains. Currently, classification of NoV strains beneath the species level has been based on sequences from different regions of the viral genome. As a result, the phylogenetic insights of some virus were not appropriately interpreted, and no consensus has been reached to establish a uniform classification scheme. To provide a consistent and reliable scientific basis for classifying NoVs, we analyzed the amino acid sequences for the major capsid protein of 164 NoV strains by first using an alignment based on the predicted 3D structures. A Bayesian tree was generated, and the maximum likelihood pairwise distances of the aligned sequences were used to evaluate the results from the uncorrected pairwise distance method. Analyses of the pairwise distances demonstrated three clearly resolved peaks, suggesting that NoV strains beneath the species level can be classified at three levels: strain (S), cluster (C), and genogroup (G). The uncorrected pairwise distance ranges for S, C, and G were 0-14.1%, 14.3-43.8%, and 44.9-61.4%, respectively. A scheme with 29 genetic clusters [8 in genogroup 1 (G1), 17 in G2, 2 in G3, and 1 each in G4 and G5] was defined on the basis of the tree topology with the standards provided and was supported by the distance analysis. Of these, five clusters in G2 and one in G1 are newly described. This analysis can serve as the basis for a standardized nomenclature to genetically describe NoV strains.
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Affiliation(s)
- Du-Ping Zheng
- Respiratory and Enteric Viruses Branch, Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
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Lochridge VP, Jutila KL, Graff JW, Hardy ME. Epitopes in the P2 domain of norovirus VP1 recognized by monoclonal antibodies that block cell interactions. J Gen Virol 2005; 86:2799-2806. [PMID: 16186235 DOI: 10.1099/vir.0.81134-0] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Noroviruses cause the majority of epidemic outbreaks of acute viral gastroenteritis worldwide. Human norovirus strains do not grow in cell culture, but recent carbohydrate binding, sequence and structural analyses have begun to define functional domains in the norovirus capsid that may be conserved among multiple antigenic types. The purpose of this study was to localize domains and define sequences in the major capsid protein VP1 that are important for cell interactions. Monoclonal antibodies to genogroups GI.1 and GII.2 reference strains Norwalk virus and Snow Mountain virus, respectively, were generated that blocked binding of recombinant virus-like particles to Caco-2 intestinal cells and inhibited haemagglutination. Peptides that mimicked the mAb binding epitopes were selected from a phage-displayed random nonapeptide library. Anti-recombinant Norwalk virus mAb 54.6 and anti-recombinant Snow Mountain virus mAb 61.21 recognized epitopes located in the protruding P2 domain of VP1. The epitope recognized by mAb 61.21 contained amino acids that are completely conserved among norovirus strains across genogroups, including strains isolated from swine, bovine and murine species. This study identifies the first epitope involved in inhibition of norovirus-cell interactions and supports increasing evidence that interactions between noroviruses and host cells rely on structures in the P2 domain of VP1.
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Affiliation(s)
- Vance P Lochridge
- Veterinary Molecular Biology Laboratory, Montana State University, PO Box 173610, Bozeman, MT 59717, USA
| | - Kathryn L Jutila
- Veterinary Molecular Biology Laboratory, Montana State University, PO Box 173610, Bozeman, MT 59717, USA
| | - Joel W Graff
- Veterinary Molecular Biology Laboratory, Montana State University, PO Box 173610, Bozeman, MT 59717, USA
| | - Michele E Hardy
- Veterinary Molecular Biology Laboratory, Montana State University, PO Box 173610, Bozeman, MT 59717, USA
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39
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Ueki Y, Sano D, Watanabe T, Akiyama K, Omura T. Norovirus pathway in water environment estimated by genetic analysis of strains from patients of gastroenteritis, sewage, treated wastewater, river water and oysters. WATER RESEARCH 2005; 39:4271-80. [PMID: 16221484 DOI: 10.1016/j.watres.2005.06.035] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2005] [Revised: 05/27/2005] [Accepted: 06/02/2005] [Indexed: 05/04/2023]
Abstract
In this study, Norovirus (NV) capsid gene was detected from patients of gastroenteritis, domestic sewage, treated wastewater, river water and cultivated oysters in geographically close areas where all of samples were collected. In order to improve recovery efficiency of NVs from oysters, a new method using a spallation apparatus was developed. As a result, 18 of 30 oysters (60%) were positive for NV gene, while 7 of 30 (23%) oysters from the same sampling point were positive with the conventional ultracentrifugal method between November 2003 and February 2004. These results indicate that our new method exhibits the higher efficiency of recovering NVs than the conventional ultracentrifugal method. Six of 8 samples (75%) of river water were positive for NV gene between November 2003 and February 2004. Furthermore, 8 of 9 samples (89%) of treated wastewater and all 9 samples of sewage were positive for NV gene in the same period. These results indicated that treated wastewater would be one of the main sources for NV pollution in this area. The phylogenetic analysis in isolated NV capsid genes was conducted, in which high identities of gene sequences between NVs from patients, domestic sewage, river water and cultivated oysters were observed. These results implied that there would be a geographically associated circulation of NVs between human and cultivated oysters via water environment. It would be important to quantitatively analyze the moving pathway of NVs, which directly link to the development of a new scheme for preventing water environment and cultivated oysters from NV contamination.
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Affiliation(s)
- You Ueki
- Department of Civil Engineering, Graduate School of Engineering, Tohoku University, Aoba06, Sendai 980-8579, Japan.
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40
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Ambert-Balay K, Bon F, Le Guyader F, Pothier P, Kohli E. Characterization of new recombinant noroviruses. J Clin Microbiol 2005; 43:5179-86. [PMID: 16207981 PMCID: PMC1248523 DOI: 10.1128/jcm.43.10.5179-5186.2005] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2004] [Revised: 01/31/2005] [Accepted: 06/20/2005] [Indexed: 11/20/2022] Open
Abstract
Noroviruses are important etiologic agents of acute gastroenteritis and show great genetic diversity. To characterize more fully previously detected strains that could not be assigned unequivocally to one particular genotype based on the RNA polymerase, we have sequenced a region in the capsid gene and, in some cases, in the junction between open reading frame 1 (ORF 1) and ORF 2. The results allowed us to identify several recombinant noroviruses: GGIIb viruses were detected for the first time in France in August 2000 and then spread through France and to Europe during the following winter. Here we present the characterization of three other probable GII recombinants which showed different phylogenetic positions depending on their ORF 1 and ORF 2 sequences. Analysis of the region located between ORF 1 and ORF 2 by a nucleotide identity window search showed a sudden shift in similarities. Moreover, recombination breakpoints were identified upstream and downstream of the beginning of ORF 2 by using a statistical test, thus confirming the involvement of this region in recombination. Unlike GGIIb, the three recombinants described here do not seem to have diffused widely in the community: one was found in a waterborne outbreak, and the other two were found in sporadic cases. Recombination is important for the evolution of RNA viruses and has already been described for noroviruses. Our results suggest that recombination is not a rare phenomenon among noroviruses, but not all these presumed recombinants that formed during RNA replication are able to spread widely.
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Affiliation(s)
- K Ambert-Balay
- Laboratoire de Virologie, Reference Laboratory for Enteric Viruses, Center Hospitalier Universitaire, 21079 Dijon, France.
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Gallimore CI, Cheesbrough JS, Lamden K, Bingham C, Gray JJ. Multiple norovirus genotypes characterised from an oyster-associated outbreak of gastroenteritis. Int J Food Microbiol 2005; 103:323-30. [PMID: 15967530 DOI: 10.1016/j.ijfoodmicro.2005.02.003] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/20/2005] [Indexed: 10/25/2022]
Abstract
The diversity of norovirus (NV) genotypes was investigated in persons who were ill with acute gastroenteritis associated with the consumption of oysters. Initial results from a commercial enzyme immunoassay (EIA) indicated a mixed NV genogroup I (GI) and II (GII) outbreak. A reverse-transcriptase (RT)-PCR for NVs was applied to nucleic acid extracted from faecal specimens collected from symptomatic cases. Using primers that amplified contiguous sequences in the ORF1/2 region of the NV genome and a hemi-nested PCR derived from this assay, three different GII and two GI NV genotypes were detected and the strains were characterised by DNA sequencing. Using this approach a recombinant NV genotype, rGII-3a (recombinant Harrow/Mexico) the predominant strain identified in several symptomatic cases from the outbreak, was detected and characterised. No other gastroenteric viruses, including rotavirus, astrovirus, sapovirus and adenovirus 40/41 were detected by RT-PCR and PCR.
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Affiliation(s)
- Chris I Gallimore
- Enteric, Respiratory and Neurological Virus Laboratory, Specialist and Reference Microbiology Division, Health Protection Agency Centre for Infections, Colindale, London, NW9 5HT, United Kingdom.
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42
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Han MG, Cheetham S, Azevedo M, Thomas C, Saif LJ. Immune responses to bovine norovirus-like particles with various adjuvants and analysis of protection in gnotobiotic calves. Vaccine 2005; 24:317-26. [PMID: 16122848 DOI: 10.1016/j.vaccine.2005.07.071] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2005] [Accepted: 07/28/2005] [Indexed: 11/16/2022]
Abstract
We evaluated serum and fecal antibody responses to bovine norovirus (BoNoV) virus-like particles (VLP) and protection against virulent BoNoV in gnotobiotic calves. Calves were vaccinated with two or three doses of VLPs (250 microg/dose) coadministered with oil, mutant E. coli heat-labile toxin (R192G) (mLT) or immunostimulating complexes (ISCOM). Fecal IgA antibody was detected only in calves vaccinated intranasally with VLP+mLT and after challenge, partial protection with delayed, shortened diarrhea (1-2 days) was observed only in these calves. Diarrhea presented from 2 to 6 days in calves vaccinated with VLP with oil or ISCOM and 8 to 9 days in controls. Virus shedding was detected post-challenge by ELISA in all vaccinated calves. All calves recovered from BoNoV infection had high titers of fecal IgA antibodies and were completed protection against challenge. We conclude that only BoNoV VLP+mLT given intranasally stimulated both serum and fecal IgA antibodies and partial protection.
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Affiliation(s)
- Myung Guk Han
- Food Animal Health Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, 1680 Madison Avenue, Wooster, OH 44691-4096, USA
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43
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Han MG, Wang Q, Smiley JR, Chang KO, Saif LJ. Self-assembly of the recombinant capsid protein of a bovine norovirus (BoNV) into virus-like particles and evaluation of cross-reactivity of BoNV with human noroviruses. J Clin Microbiol 2005; 43:778-85. [PMID: 15695679 PMCID: PMC548067 DOI: 10.1128/jcm.43.2.778-785.2005] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
None of the enteric caliciviruses except Po/Sapo/GIII/Cowden/80/US replicates in cell culture, which complicates efforts to develop control strategies or to study viral replication. To develop serological assays for bovine noroviruses (BoNVs) and to determine the cross-reactivity of BoNV with human noroviruses, we generated two recombinant baculoviruses, rCV186-OH and rJNCV, to express the capsid genes of Bo/CV186-OH/00/US (Norovirus genogroup III [GIII], genotype 2 [GIII/2]). rCV186-OH expressed the expected 57-kDa capsid protein, but rJNCV expressed a truncated capsid protein of 35 kDa. Sequence analysis of rJNCV identified a single nucleotide deletion in the P domain of the capsid gene, which introduced a stop codon at amino acid 323. The recombinant capsid protein produced by rCV186-OH but not that produced by rJNCV self-assembled into virus-like particles (VLPs) similar to native BoNV. An antibody-capture enzyme-linked immunosorbent assay (ELISA) and antigen-capture ELISA (Ag-ELISA) detected serum antibody and antigen, respectively, from calves infected with Bo/CV186-OH/00/US but not antibodies or antigens to other enteric viruses. In other tests of the GIII/2 BoNV Ag-ELISA, no cross-reactivity was observed with VLPs from one GI and four GII human noroviruses and porcine sapovirus Cowden strain. Because, like human noroviruses, BoNVs do not grow in cell culture, the BoNV VLPs will be useful in the serological assays described for the detection of BoNV antibody and antigen. Consistent with the phylogenetic analysis of the capsid genes of bovine and human noroviruses (M. G. Han, J. R. Smiley, C. Thomas, and L. J. Saif, J. Clin. Microbiol. 42:5214-5224, 2004), the results suggest that GIII/2 BoNV does not share significant antigenic relationships with the five characterized human noroviruses tested.
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Affiliation(s)
- M G Han
- Food Animal Health Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, 1680 Madison Ave., Wooster, OH 44691, USA
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Tan M, Jiang X. Norovirus and its histo-blood group antigen receptors: an answer to a historical puzzle. Trends Microbiol 2005; 13:285-93. [PMID: 15936661 DOI: 10.1016/j.tim.2005.04.004] [Citation(s) in RCA: 250] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2005] [Revised: 04/01/2005] [Accepted: 04/21/2005] [Indexed: 11/16/2022]
Abstract
Recent findings demonstrate that human histo-blood group antigens (HBGAs) serve as receptors for norovirus infection. The recognition of human HBGAs by noroviruses is a typical protein-carbohydrate interaction, in which the protruding domain of the viral capsid protein forms an interface with the oligosaccharide side-chains of the antigens, with a wide diversity among different strains. The human HBGA system is also highly polymorphic and is controlled by multiple gene families with silent alleles. The presence of such diversified molecules on the cell surfaces indicates a possible host defense mechanism against the changing external environment. As mild pathogens that replicate possibly only in the intestinal tract, noroviruses have developed unique strategies to overcome the host defense system. This has been shown by their genetic and structural variations, which explains why norovirus-associated diseases are so common and widespread in every population worldwide.
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Affiliation(s)
- Ming Tan
- Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
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45
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Abstract
Noroviruses are single-stranded RNA viruses with high genomic variability. They have emerged in the last decade as a major cause of acute gastroenteritis. It remains so far unclear whether norovirus evolution is driven by sequence mutation and/or recombination. In this study, we have assessed the occurrence of recombination in the norovirus capsid gene. For this purpose, 69 complete capsid sequences of norovirus strains accessible in GenBank as well as 25 complete capsid sequences generated from norovirus-positive clinical samples were examined. Unreported recombination was detected in about 8% of norovirus strains belonging to genetic clusters I/1 (n = 1), II/1 (n = 1), II/3 (n = 1), II/4 (n = 3), and II/5 (n = 1). Recombination breakpoints were mainly located at the interface of the putative P1-1 and P2 domains of the capsid protein and/or within the P2 domain. The recombination region displayed features such as length, sequence composition (upstream and downstream GC- and AU-rich sequences, respectively), and predicted RNA secondary structure that are characteristic of homologous recombination activators. Our results suggest that recombination in the norovirus capsid gene may naturally occur, involving capsid domains presumably exposed to immunological pressure.
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Affiliation(s)
- Jacques Rohayem
- Institut für Virologie, The Calicilab, Fetscherstr. 74, D-01307 Dresden, Germany.
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46
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Abstract
Application of recent techniques to detect current pathogens in archival effluent samples collected and concentrated in 1987 lead to the characterization of norovirus GGII.6 Seacroft, unrecognized until 1990 in a clinical sample. Retrospective studies will likely increase our knowledge about waterborne transmission of emerging pathogens.
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Affiliation(s)
- Sylvain Skraber
- National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | - Ronald Italiaander
- National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | - Willemijn J. Lodder
- National Institute for Public Health and the Environment, Bilthoven, The Netherlands
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Han MG, Smiley JR, Thomas C, Saif LJ. Genetic recombination between two genotypes of genogroup III bovine noroviruses (BoNVs) and capsid sequence diversity among BoNVs and Nebraska-like bovine enteric caliciviruses. J Clin Microbiol 2005; 42:5214-24. [PMID: 15528717 PMCID: PMC525163 DOI: 10.1128/jcm.42.11.5214-5224.2004] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
To determine the genogroups and genotypes of bovine enteric caliciviruses (BECVs) circulating in calves, we determined the complete capsid gene sequences of 21 BECVs. The nucleotide and predicted amino acid sequences were compared phylogenetically with those of known human and animal enteric caliciviruses. Based on these analyses, 15 BECVs belonged to Norovirus genogroup III and genotype 2 (GIII/2) and were genetically distinct from human Norovirus GI and GII. Six BECVs had capsid gene sequences similar to that of the unclassified Nebraska (NB)-like BECV. The 15 bovine noroviruses (BoNVs) were more closely related to Bo/NLV/Newbury-2/76/UK (GIII/2) and other known genotype 2 BoNVs than to genotype 1 Bo/NLV/Jena/80/DE. The BoNV Bo/CV521-OH/02/US showed high nucleotide and amino acid identities (84 and 94%, respectively) with the capsid gene of Bo/NLV/Newbury-2/76/UK, whereas the nucleotide and amino acid sequences of the RNA polymerase gene were more closely related to those of Bo/NLV/Jena/80/DE (77 and 87% identities, respectively) than to those of Bo/NLV/Newbury-2/76/UK (69 and 69% identities, respectively), suggesting that Bo/CV521-OH/02/US is a genotype 1-2 recombinant. Gene conversion analysis by the recombinant identification program and SimPlot also predicted that Bo/CV521-OH/02/US was a recombinant. Six NB-like BECVs shared 88 to 92% nucleotide and 94 to 99.5% amino acid identities with the NB BECV in the capsid gene. The results of this study demonstrate genetic diversity in the capsid genes of BECVs circulating in Ohio veal calves, provide new data for coinfections with distinct BECV genotypes or genogroups, and describe the first natural BoNV genotype 1-2 recombinant, analogous to the previously reported human norovirus recombinants.
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Affiliation(s)
- Myung Guk Han
- Food Animal Health Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, OH 44691, USA
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48
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Reuter G, Krisztalovics K, Vennema H, Koopmans M, Szucs G. Evidence of the etiological predominance of norovirus in gastroenteritis outbreaks—emerging new-variant and recombinant noroviruses in Hungary. J Med Virol 2005; 76:598-607. [PMID: 15977235 DOI: 10.1002/jmv.20403] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Between January 2001 and December 2003, stool specimens from 262 (45%) of 581 reported outbreaks of gastroenteritis were investigated for noroviruses in Hungary. Specimens collected from outbreaks of non-bacterial gastroenteritis were examined by reverse-transcription polymerase chain reaction and enzyme immunoassay. In 253 (97%) of 262 outbreaks, norovirus was detected and confirmed by sequencing in 211 (81%). Hospitals (35%), day care centers (30%), and elderly homes (27%) were the most common settings. Diversity and frequency of the genotypes changed over time but with predominance (95%) of genogroup (GG) II strains. Strains grouped into 11 genotypes including an epidemic spread of new-variant GGII4 (Lordsdale virus) and a recently emerged group of natural recombinant strains (GGIIb/Hilversum polymerase) with four capsid types (Hawaii, Mexico, Snow Mountain, and Lordsdale). Clusters of epidemics including food-borne outbreaks were detected. According to this study, noroviruses are the predominant etiological agents causing gastroenteritis outbreaks in Hungary.
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Affiliation(s)
- Gábor Reuter
- Regional Laboratory of Virology, ANTSZ Baranya County Institute of State Public Health Service, Pécs, Hungary.
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Chakravarty S, Hutson AM, Estes MK, Prasad BVV. Evolutionary trace residues in noroviruses: importance in receptor binding, antigenicity, virion assembly, and strain diversity. J Virol 2005; 79:554-68. [PMID: 15596848 PMCID: PMC538680 DOI: 10.1128/jvi.79.1.554-568.2005] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2004] [Accepted: 08/30/2004] [Indexed: 11/20/2022] Open
Abstract
Noroviruses cause major epidemic gastroenteritis in humans. A large number of strains of these single-stranded RNA viruses have been reported. Due to the absence of infectious clones of noroviruses and the high sequence variability in their capsids, it has not been possible to identify functionally important residues in these capsids. Consequently, norovirus strain diversity is not understood on the basis of capsid functions, and the development of therapeutic compounds has been hampered. To determine functionally important residues in noroviruses, we have analyzed a number of norovirus capsid sequences in the context of the Norwalk virus capsid crystal structure by using the evolutionary trace method. This analysis has identified capsid protein residues that uniquely characterize different norovirus strains and provide new insights into capsid assembly and disassembly pathways and the strain diversity of these viruses. Such residues form specific three-dimensional clusters that may be of functional importance in noroviruses. One of these clusters includes residues known to participate in the proteolytic cleavage of these viruses at high pH. Other clusters are formed in capsid regions known to be important in the binding of antibodies to noroviruses, thereby indicating residues that may be important in the antigenicity of these viruses. The highly variable region of the capsid shows a distinct cluster whose residues may participate in norovirus-receptor interactions.
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Affiliation(s)
- Sugoto Chakravarty
- Verna and Marrs Mclean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, Texas 77030-3498, USA
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Radford AD, Gaskell RM, Hart CA. Human norovirus infection and the lessons from animal caliciviruses. Curr Opin Infect Dis 2004; 17:471-8. [PMID: 15353967 DOI: 10.1097/00001432-200410000-00012] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
PURPOSE OF REVIEW Human noroviruses are a major cause of infectious intestinal disease, particularly in the health sector, with considerable knock-on effects on care provision through ward closures and staff sickness. This review will describe recent advances in our understanding of human noroviruses. In addition, we will consider related nonhuman caliciviruses to highlight some potential difficulties in the control of caliciviral disease. RECENT FINDINGS Using more sensitive reverse transcriptase polymerase chain reaction based assays, noroviruses are now recognized as the most common cause of infectious intestinal disease in the community, as well as outbreaks of the infectious intestinal disease. After recovery from acute disease, some individuals continue shedding norovirus, particularly if immunosuppressed. The noroviruses are extremely variable, which has important implications for protection following challenge, and for future vaccination. From amongst this variability, new strains have emerged with the potential to spread widely. Recently a mouse norovirus has been identified which will afford new insights into the biology of these important viruses. Studies on human susceptibility have identified some resistant individuals in the population and a potential virus receptor, which may lead to the development of novel antiviral therapies. SUMMARY Lack of cell culture systems for the human noroviruses is being overcome by molecular technologies. Such studies have provided new insight into the significance and epidemiology of these viruses and opened the possibility of disease control through vaccination. Work on nonhuman caliciviruses has interesting parallels with human noroviruses, and provides new insights into the understanding of these important human pathogens.
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Affiliation(s)
- Alan D Radford
- University of Liverpool, Leahurst Veterinary Teaching Hospital, Neston, S. Wirral CH64 7TE, UK.
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