title: [Outbreak of pandemic virus (H1N1) 2009 in a residence for mentally disabled persons in Balearic Island, Spain].
abstract: BACKGROUND
  The flu season 2009-2010 has been shorter and less severe than expected. Since January 2010, influenza surveillance systems indicated rates of very low incidence of influenza without detection of virus circulation. In this context, a hospital reported a suspected outbreak of severe respiratory disease, the aetiology proved influenza A(H1N1)v. We describe the outbreak and public health measures for their control.
  
  
  METHODS
  Descriptive study of an outbreak of pandemic influenza virus in a residency home for mentally disabled. Establishment of active surveillance. The case definition of influenza was very sensitive to detect new cases early, treated early and minimize transmission. Steps were taken to contain the influenza virus infection.
  
  
  RESULTS
  Among 38 cases detected 7 had serious complications(all of them with risk factors). There were no deaths. The overall attack rate was 35.2%. The first cases were workers. The residents were ill at the peak of the outbreak, and among workers the presentation was more dispersed. None of the workers and only three of residents had been vaccinated.
  
  
  CONCLUSIONS
  Workers possibly have initiated and contributed to the maintenance of transmission. We emphasize the need to comply with vaccination recommendations, not just those with risk factors, but particularly for workers in contact with those.
authors.affiliation: Servicio de Epidemiología, Dirección General de Salud Pública y Participación, Conselleria de Salut i Consum, Govern de les Illes Balears, Palma de Mallorca, Spain. jgimenez@dgsanita.caib.es
authors.forename: Jaume
authors.initials: J
authors.lastname: Giménez Duran
authors.forename: Antònia
authors.initials: A
authors.lastname: Galmés Truyols
authors.forename: Antonio
authors.initials: A
authors.lastname: Nicolau Riutort
authors.forename: Jorge
authors.initials: J
authors.lastname: Reina Prieto
authors.forename: Maria de Carmen
authors.initials: Mde C
authors.lastname: Gallegos Álvarez
authors.forename: Antonio
authors.initials: A
authors.lastname: Pareja Bezares
authors.forename: Juana María
authors.initials: JM
authors.lastname: Vanrell Berga
mesh_terms: D003428:Cross Infection / Q000150:complications / Q000453:epidemiology*; D006233:Persons with Disabilities; D004196:Disease Outbreaks; D005260:Female; D006268:Health Facilities; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000150:complications / Q000453:epidemiology*; D008297:Male; D001523:Mental Disorders / Q000150:complications; D008875:Middle Aged; D013030:Spain / Q000453:epidemiology