2021
DOI: 10.3390/pathogens10121624
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Assessment of Food and Waterborne Viral Outbreaks by Using Field Epidemiologic, Modern Laboratory and Statistical Methods—Lessons Learnt from Seven Major Norovirus Outbreaks in Finland

Abstract: Seven major food- and waterborne norovirus outbreaks in Western Finland during 2014–2018 were re-analysed. The aim was to assess the effectiveness of outbreak investigation tools and evaluate the Kaplan criteria. We summarised epidemiological and microbiological findings from seven outbreaks. To evaluate the Kaplan criteria, a one-stage meta-analysis of data from seven cohort studies was performed. The case was defined as a person attending an implicated function with diarrhoea, vomiting or two other symptoms.… Show more

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“…The prevalence of asymptomatic NoV infection was the highest in foodborne outbreaks, followed by waterborne and human-to-human outbreaks. This may be related to the likelihood and dose of subjects exposure to NoV over a short period of time gradually decrease in general, from food-borne outbreaks to water-borne outbreaks to human-to-human outbreaks [ 33 , 34 ]. In human-to-human outbreaks, some close contacts may not even be exposed to the virus.…”
Section: Discussionmentioning
confidence: 99%
“…The prevalence of asymptomatic NoV infection was the highest in foodborne outbreaks, followed by waterborne and human-to-human outbreaks. This may be related to the likelihood and dose of subjects exposure to NoV over a short period of time gradually decrease in general, from food-borne outbreaks to water-borne outbreaks to human-to-human outbreaks [ 33 , 34 ]. In human-to-human outbreaks, some close contacts may not even be exposed to the virus.…”
Section: Discussionmentioning
confidence: 99%