title: Molecular epidemiology of oyster-related human noroviruses and their global genetic diversity and temporal-geographical distribution from 1983 to 2014.
abstract: Noroviruses (NoVs) are a leading cause of epidemic and sporadic cases of acute gastroenteritis worldwide. Oysters are well recognized as the main vectors of environmentally transmitted NoVs, and disease outbreaks linked to oyster consumption have been commonly observed. Here, to quantify the genetic diversity, temporal distribution, and circulation of oyster-related NoVs on a global scale, 1,077 oyster-related NoV sequences deposited from 1983 to 2014 were downloaded from both NCBI GenBank and the NoroNet outbreak database and were then screened for quality control. A total of 665 sequences with reliable information were obtained and were subsequently subjected to genotyping and phylogenetic analyses. The results indicated that the majority of oyster-related NoV sequences were obtained from coastal countries and regions and that the numbers of sequences in these regions were unevenly distributed. Moreover, >80% of human NoV genotypes were detected in oyster samples or oyster-related outbreaks. A higher proportion of genogroup I (GI) (34%) was observed for oyster-related sequences than for non-oyster-related outbreaks, where GII strains dominated with an overwhelming majority of >90%, indicating that the prevalences of GI and GII are different in humans and oysters. In addition, a related convergence of the circulation trend was found between oyster-related NoV sequences and human pandemic outbreaks. This suggests that oysters not only act as a vector of NoV through environmental transmission but also serve as an important reservoir of human NoVs. These results highlight the importance of oysters in the persistence and transmission of human NoVs in the environment and have important implications for the surveillance of human NoVs in oyster samples.
authors: College of Food Science and Technology, Shanghai Ocean University, Shanghai, China Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation, Ministry of Agriculture, Shanghai, China.
authors: Yongxin
authors: Y
authors: Yu
authors: College of Food Science and Technology, Shanghai Ocean University, Shanghai, China Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation, Ministry of Agriculture, Shanghai, China.
authors: Hui
authors: H
authors: Cai
authors: College of Food Science and Technology, Shanghai Ocean University, Shanghai, China Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation, Ministry of Agriculture, Shanghai, China.
authors: Linghao
authors: L
authors: Hu
authors: College of Food Science and Technology, Shanghai Ocean University, Shanghai, China.
authors: Rongwei
authors: R
authors: Lei
authors: College of Food Science and Technology, Shanghai Ocean University, Shanghai, China Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation, Ministry of Agriculture, Shanghai, China.
authors: Yingjie
authors: Y
authors: Pan
authors: College of Food Science and Technology, Shanghai Ocean University, Shanghai, China Institute of Biochemistry and Molecular Cell Biology, University of Göttingen, Göttingen, Germany.
authors: Shuling
authors: S
authors: Yan
authors: College of Food Science and Technology, Shanghai Ocean University, Shanghai, China Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation, Ministry of Agriculture, Shanghai, China yjwang@shou.edu.cn.
authors: Yongjie
authors: Y
authors: Wang
mesh_terms: D000818:Animals; D017250:Caliciviridae Infections / Q000453:epidemiology* / Q000821:virology; D019295:Computational Biology / Q000379:methods; D005517:Foodborne Diseases / Q000453:epidemiology* / Q000821:virology; D014644:Genetic Variation; D005838:Genotype; D014943:Global Health; D006801:Humans; D017720:Molecular Epidemiology; D029322:Norovirus / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D010125:Ostreidae / Q000821:virology*; D058974:Phylogeography