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An outbreak of norovirus infection caused by ice cubes and a leaking air ventilation valve

Authors :
Haider Al-Hello
Sirpa Räsänen
Ari Kauppinen
Katri Jalava
University of Helsinki, Departments of Faculty of Veterinary Medicine
Source :
Epidemiology and Infection
Publication Year :
2018
Publisher :
Cambridge University Press (CUP), 2018.

Abstract

A gastrointestinal outbreak was reported among 154 diners who attended a Christmas buffet on the 9 and 10 December 2016. A retrospective cohort study was undertaken. Faecal samples, water, ice and an air ventilation device were tested for indicators and routine pathogens. Altogether 26% (24/91) fulfilled the case definition of having typical viral gastrointestinal symptoms. Norovirus genogroup I was detected in faecal samples from three cases. One of these cases tested positive also for sapovirus and had a family member testing positive for both norovirus and sapovirus. A diner who drank water or drinks with ice cubes (risk ratios (RR) 6.5, 95% confidence intervals (CI) 1.5–113.0) or both (RR 8.2, 95% CI 1.7–145.5) had an increased risk in a dose-response manner. Ice cubes from three vending machines had high levels of heterotrophic bacteria. A faulty air ventilation valve in the space where the ice cube machine was located was considered a likely cause of this outbreak. Leaking air ventilation valves may represent a neglected route of transmission in viral gastrointestinal outbreaks.

Details

ISSN :
14694409 and 09502688
Volume :
147
Database :
OpenAIRE
Journal :
Epidemiology and Infection
Accession number :
edsair.doi.dedup.....d61b6515f7f7109f21707fb80b6b446f