Negative Correlation between the Prevalence of Norovirus and High Bacterial Loads of Escherichia coli in Oysters Crassostrea gigas

Oh, Eun-Gyoung;Song, Ki Cheol;Kim, Sukyung;Park, Kunbawui;Yu, Hongsik

  • 투고 : 2015.05.08
  • 심사 : 2015.07.13
  • 발행 : 2015.09.30


Seasonal variation in the prevalence of norovirus in oysters Crassostrea gigas was investigated and compared to levels of Escherichia coli, a fecal indicator in oysters. Oysters were collected from Iwon-myeon, Taean-gun, Korea, a primary production area for European Union export of oysters between 2013 and 2014. We observed seasonality in the prevalence of norovirus in oysters, with a higher prevalence and viral load detected during winter months. Oysters taken from production areas that complied with the European Union standard for raw consumption (< 230 MPN/100 g of E. coli) had 22.1% of the samples test positive for norovirus (15/68 samples). However, norovirus was not detected in any of the samples (0%, 0/4 samples) that were collected from production sites that exceeded the standard fecal contamination level for raw consumption (> 230 MPN/100 g of E. coli). These results indicated that there is a negative correlation between the prevalence of norovirus and high levels of E. coli in oysters. Therefore, our results suggest that current food safety guidelines using only a bacterial fecal contamination indicator, E. coli, may not adequately assess shellfish production areas for viral and bacterial contamination.


Bivalve molluscs;Oyster;Norovirus;Fecal indicator;Escherichia coli


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피인용 문헌

  1. Influence of Environmental Conditions on Norovirus Presence in Mussels Harvested in Montenegro vol.9, pp.4, 2017,


연구 과제 주관 기관 : National Fisheries Research and Development Institute of Korea