Foodborne norovirus outbreak : the role of an asymptomatic food handler
Barrabeig, Irene (Generalitat de Catalunya. Departament de Salut)
Rovira, Ariadna (Generalitat de Catalunya. Departament de Salut)
Buesa, Javier (Department of Microbiology. University of Valencia, Spain)
Bartolomé Comas, Rosa Maria (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia)
Pintó, Rosa (Universitat de Barcelona. Laboratori de Virus Entèrics)
Prellezo, Hortènsia (Generalitat de Catalunya. Departament de Salut)
Domínguez, Ángela (Universitat de Barcelona. Departament de Salut Pública)

Fecha:	2010
Resumen:	In July 2005 an outbreak of acute gastroenteritis occurred on a residential summer camp in the province of Barcelona (northeast of Spain). Forty-four people were affected among residents and employees. All of them had in common a meal at lunch time on 13 July (paella, round of beef and fruit). The aim of this study was to investigate a foodborne norovirus outbreak that occurred in the residential summer camp and in which the implication of a food handler was demonstrated by laboratory tests. A retrospective cohort study was designed. Personal or telephone interview was carried out to collect demographic, clinical and microbiological data of the exposed people, as well as food consumption in the suspected lunch. Food handlers of the mentioned summer camp were interviewed. Ten stool samples were requested from symptomatic exposed residents and the three food handlers that prepared the suspected food. Stools were tested for bacteries and noroviruses. Norovirus was detected using RT-PCR and sequence analysis. Attack rate, relative risks (RR) and its 95% confidence intervals (CI) were calculated to assess the association between food consumption and disease. The global attack rate of the outbreak was 55%. The main symptoms were abdominal pain (90%), nausea (85%), vomiting (70%) and diarrhoea (42. 5%). The disease remitted in 24-48 hours. Norovirus was detected in seven faecal samples, one of them was from an asymptomatic food handler who had not eaten the suspected food (round of beef), but cooked and served the lunch. Analysis of the two suspected foods isolated no pathogenic bacteria and detected no viruses. Molecular analysis showed that the viral strain was the same in ill patients and in the asymptomatic food handler (genotype GII. 2 Melksham-like). In outbreaks of foodborne disease, the search for viruses in affected patients and all food handlers, even in those that are asymptomatic, is essential. Health education of food handlers with respect to hand washing should be promoted.
Ayudas:	Instituto de Salud Carlos III PI 030877 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-42
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	BMC Infectious diseases, Vol. 10 (9 2010) , p. 269, ISSN 1471-2334

DOI: 10.1186/1471-2334-10-269
PMID: 20843351

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