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An outbreak of Norovirus infections associated with recreational lake water in Western Finland, 2014.
Polkowska, A; Räsänen, S; Al-Hello, H; Bojang, M; Lyytikäinen, O; Nuorti, J P; Jalava, K.
Afiliación
  • Polkowska A; Department of Epidemiology, Health Sciences, Faculty of Social Sciences, University of Tampere, Tampere, Finland.
  • Räsänen S; Infectious Diseases Control Unit, City of Tampere, Tampere, Finland.
  • Al-Hello H; Expert Microbiology Unit, National Institute for Health and Welfare (THL), Helsinki, Finland.
  • Bojang M; Department of Environmental Health, City of Tampere, Tampere, Finland.
  • Lyytikäinen O; Department of Health Security, National Institute for Health and Welfare (THL), Helsinki, Finland.
  • Nuorti JP; Department of Epidemiology, Health Sciences, Faculty of Social Sciences, University of Tampere, Tampere, Finland.
  • Jalava K; Department of Health Security, National Institute for Health and Welfare (THL), Helsinki, Finland.
Epidemiol Infect ; 146(5): 544-550, 2018 04.
Article en En | MEDLINE | ID: mdl-29477156
In July 2014, an outbreak of gastroenteritis occurred among visitors to lakes in Tampere, Finland. We conducted a retrospective cohort study using an internet-based survey, solicited by public announcement, to identify source of infection and to implement control measures. Of 1453 persons enrolled in the study, 244 met the case definition (attack rate, 17%). In the pooled univariate analysis, risk factors for gastroenteritis included getting water in the mouth while swimming (Risk ratio (RR) 3.32; 95% Confidence interval (CI), 2.36-4.68) and playing on the wet sand at the beach (RR 1.90; 95% CI 1.50-2.41). In a multivariable analysis (logistic regression), the source of the infection was likely at two lakes (lake A Odds ratio (OR) 1.66; 95% CI 1.15-2.39 and lake B, OR 2.35; 95% CI 1.49-3.72). Norovirus (NoV) was found in 19 stool samples. All water samples from implicated beaches had acceptable values of fecal indicator bacteria and were negative for NoV. The likely source of the outbreak was lake-water contaminated with NoV at two popular lakes. Closure of swimming beaches, advice on hygienic precautions and rapid outbreak alerts were efficient in controlling the outbreak. Results suggest a need for new indicators of water quality and development of evidence-based recommendations regarding timing of safe reopen of recreational water venues associated with outbreaks.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Natación / Playas / Lagos / Brotes de Enfermedades / Infecciones por Caliciviridae / Gastroenteritis Tipo de estudio: Etiology_studies / Incidence_studies / Observational_studies / Prognostic_studies / Risk_factors_studies Límite: Adolescent / Adult / Aged / Child / Child, preschool / Female / Humans / Infant / Male / Middle aged País/Región como asunto: Europa Idioma: En Revista: Epidemiol Infect Asunto de la revista: DOENCAS TRANSMISSIVEIS / EPIDEMIOLOGIA Año: 2018 Tipo del documento: Article País de afiliación: Finlandia Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Natación / Playas / Lagos / Brotes de Enfermedades / Infecciones por Caliciviridae / Gastroenteritis Tipo de estudio: Etiology_studies / Incidence_studies / Observational_studies / Prognostic_studies / Risk_factors_studies Límite: Adolescent / Adult / Aged / Child / Child, preschool / Female / Humans / Infant / Male / Middle aged País/Región como asunto: Europa Idioma: En Revista: Epidemiol Infect Asunto de la revista: DOENCAS TRANSMISSIVEIS / EPIDEMIOLOGIA Año: 2018 Tipo del documento: Article País de afiliación: Finlandia Pais de publicación: Reino Unido