In Situ Capture RT-qPCR:A new simple and sensitive method to detect human norovirus in oysters

来源 :2016第五届中国食品安全高峰论坛 | 被引量 : 0次 | 上传用户:angelboy8100
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  Human noroviruses (HuNoVs) are the major cause worldwide for non-bacterial acute gastroenteritis.RT-qPCR is a widely-used method for the detection of HuNoVs.However, this method is unable to discriminate between infectious and non-infectious viruses.In this study, we applied a novel viral receptor mediated in situ capture RT-qPCR (ISC-RT-qPCR) to detect HuNoVs in oysters and compared with the traditional RT-qPCR method.Ten HuNoVs RT-PCR positive and 5 negative clinical samples from gastroenteritis patients were used to compare specificity and sensitivity of ISC-RT-qPCR against that of the RT-qPCR assay.ISC-RT-qPCR had at a one-log or a two-log increase in sensitivity over that of the RT-qPCR assay for genotype Ⅰ (GⅠ) and GⅡ,respectively.Distributions of HuNoVs in oyster tissues were investigated in artificially inoculated oysters.GⅠ HuNoVs could be detected in all tissues in inoculated oysters by both ISC-RT-qPCR and RT-qPCR.GⅡ HuNoVs could only be detected in gills and digestive glands by both methods.The number of viral genomic copies (vgc) measured by ISC-RT-qPCR was comparable with RT-qPCR in the detection of GⅠ and GⅡ HuNoVs in inoculated oysters.Thirty-six oyster samples from local market were assayed for HuNoVs by both assays.More HuNoVs could be detected by ISC-RT-qPCR in retail oysters.The detection rates of GⅠ HuNoVs in gills,digestive glands, and residual tissues were 33.3%, 25.0%, and 19.4% by ISC-RT-qPCR;and 5.6%, 11.1%, and 11.1% by RT-qPCR, respectively.The detection rates ofGⅡ HuNoVs in gills were 2.8% by ISC-RT-qPCR;no GⅡ HuNoV was detected in these oysters by RT-qPCR.Overall, all results demonstrated that ISC-RT-qPCR was a promising method for detecting HuNoVs in oyster samples.
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