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Detection of Potential Infectious Enteric Viruses in Fresh Produce by (RT)-qPCR Preceded by Nuclease Treatment

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Abstract

Foodborne illnesses associated with contaminated fresh produce are a common public health problem and there is an upward trend of outbreaks caused by enteric viruses, especially human noroviruses (HNoVs) and hepatitis A virus (HAV). This study aimed to assess the use of DNase and RNase coupled to qPCR and RT-qPCR, respectively, to detect intact particles of human adenoviruses (HAdVs), HNoV GI and GII and HAV in fresh produce. Different concentrations of DNase and RNase were tested to optimize the degradation of free DNA and RNA from inactivated HAdV and murine norovirus (MNV), respectively. Results indicated that 10 µg/ml of RNase was able to degrade more than 4 log10 (99.99%) of free RNA, and 1 U of DNase degraded the range of 0.84–2.5 log10 of free DNA depending on the fresh produce analysed. The treatment with nucleases coupled to (RT)-qPCR was applied to detect potential infectious virus in organic lettuce, green onions and strawberries collected in different seasons. As a result, no intact particles of HNoV GI and GII were detected in the 36 samples analysed, HAdV was found in one sample and HAV was present in 33.3% of the samples, without any reasonable distribution pattern among seasons. In conclusion, RT-qPCR preceded by RNase treatment of eluted samples from fresh produce is a good alternative to detect undamaged RNA viruses and therefore, potential infectious viruses. Moreover, this study provides data about the prevalence of enteric viruses in organic fresh produce from Brazil.

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Acknowledgements

E. Marti received a “Bolsa Jovens Talentos (BJT)” scholarship (303491/2014-0) from the Science without Borders Programme from the National Council for Scientific and Technological Development (CNPq; Brazil Government). The same CNPq programme (Project 400183/2014-5) also supported this work.

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Marti, E., Ferrary-Américo, M. & Barardi, C.R.M. Detection of Potential Infectious Enteric Viruses in Fresh Produce by (RT)-qPCR Preceded by Nuclease Treatment. Food Environ Virol 9, 444–452 (2017). https://doi.org/10.1007/s12560-017-9300-x

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