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A longitudinal study on enteric virus contamination in bivalves along the coast of Ibaraki Prefecture, Japan.

During the 2014-2018 seasons, we conducted a longitudinal study involving enteric virus surveillance in bivalves, including natural oysters and clams harvested in Ibaraki Prefecture, Japan. Some norovirus (NoV) contaminations were detected in natural oysters, while no enteric virus was found in clams. NoV detected in oysters were of the genotypes GII.4 and GII.6, which are closely related genetically to the NoV strains prevalent in humans. We found low level of enteric virus contamination in bivalves collected along the coast of Ibaraki Prefecture. The possibility of food poisoning caused by these viruses appears low, and few cases of infectious disease have been observed in the surrounding area. The harvest timing was more related to detection of enteric viruses than the harvest area. Our results highlighted the fact that contamination of bivalves by enteric viruses may depend upon the prevalence of human diarrhea and illness.