Objectives To examine the contamination of norovirus(the genus Norovirus of the family Caliciviridae)in oysters collected from markets in the City of Haikou in order to provide a reference for prevention of norovirus disease.Methods Oyster samples were randomly collected from 20 markets in Haikou from September 2015 to May 2016.Viral RNA was extracted from the digestive gland of oysters.The genogroup of norovirus(GI and GII)was detected using real-time fluorescence quantitative PCR.The reliability of this d...