Epidemiology and estimated costs of a large waterborne outbreak of norovirus infection in Sweden

Author:

LARSSON C.,ANDERSSON Y.,ALLESTAM G.,LINDQVIST A.,NENONEN N.,BERGSTEDT O.

Abstract

SUMMARYA large outbreak of norovirus (NoV) gastroenteritis caused by contaminated municipal drinking water occurred in Lilla Edet, Sweden, 2008. Epidemiological investigations performed using a questionnaire survey showed an association between consumption of municipal drinking water and illness (odds ratio 4·73, 95% confidence interval 3·53–6·32), and a strong correlation between the risk of being sick and the number of glasses of municipal water consumed. Diverse NoV strains were detected in stool samples from patients, NoV genotype I strains predominating. Although NoVs were not detected in water samples, coliphages were identified as a marker of viral contamination. About 2400 (18·5%) of the 13 000 inhabitants in Lilla Edet became ill. Costs associated with the outbreak were collected via a questionnaire survey given to organizations and municipalities involved in or affected by the outbreak. Total costs including sick leave, were estimated to be ∼8 700 000 Swedish kronor (∼€0·87 million).

Publisher

Cambridge University Press (CUP)

Subject

Infectious Diseases,Epidemiology

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