Sequence Analysis and Quantitative Detection of Norwalk-like Viruses in Cultured Oysters of China

We isolated 4 Norwalk-like viruses (NLVs) contaminated oysters from 33 Chinese oysters collected from local commer-cial sources of Shandong Province. After amplification of the RNA-dependent RNA polymerase (RdRp) region of NLVs genomes with RT-PCR, the open reading frame 1 (ORF1) of the RdRp was sequenced and subjected to multiple-sequence alignment. The re-suits showed that NLVs in the four isolates belong to genogroup Ⅱ. The sequence comparison showed that the similarity between four Chinese oyster isolates were higher than 99.0%, which indicated that NLVs prevalent in close areas have high homogeneity in genome sequences. In addition, the most conserved sequences between diverse NLVs were used to design primers and TaqMan probes, then the real-time quantitative PCR assay was performed. According to the standard curve of GII NLVs, the original amounts (copies) of NLVs in positive patient's fecal isolate, positive Japanese oyster isolate, and the Chinese oyster isolate were 8.9×108, 1.25×108 and 4.7×101 respectively. The detecting limit of NLVs was 1×101 copies. This study will be helpful for routine diagnosis of NLVs pathogens in foods and thus for avoiding food poisoning in the future.

作 者： WANG Jun TANG Qingjuan YUE Zhiqin LI Zhaojie ZHANG Jin XUE Changhu   作者單位： WANG Jun,TANG Qingjuan,LI Zhaojie,ZHANG Jin,XUE Changhu(Institute of Food Science and Technology, Ocean University of China, Qingdao 266003, P. R. China)

YUE Zhiqin(Inspection and Quarantine Bureau of Shandong, Qingdao 266003, P. R. China) 

刊 名： 中國海洋大學學報（英文版）  ISTIC 英文刊名： JOURNAL OF OCEAN UNIVERSITY OF CHINA  年，卷(期)： 2008 7(2)  分類號： P7  關鍵詞： oysters   Norwalk-like viruses (NLVs)   reverse transcription polymerase chain reaction (RT-PCR)   sequence analysis   real time quantitative PCR  

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