Factores asociados a la transmission a los convivientes de gripe (H1N1) 2009

Translated title of the contribution: Factors associated with household transmission of Influenza (H1N1) 2009

Hernán Vargas-Leguas, Joan A. Caylà, Isabel Ballester, Rosana Burgui, Maite Morteruel, Olivia Horna, Juan Bellido, Jesús Castilla, Anna Martínez, Pere Godoy

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Bakcground: A good part of the transmission of influenza occurs in the household context. The main objective of this study was to evaluate the factors associatedwith the index cases generating secondary cases in household. Methods: We designed an observational, retrospective, multicenter through the implementation of a telephone survey in three regions of Spain. The study population were hospitalized and outpatient cases of confirmed H1N1 (2009) reported to the surveillance units from week 44 of 2009.We calculated the secondary attack rate within the household (TAI) and confidence interval of 95%. Factors associated with household transmission were analyzed by logistic regression, calculating odds ratios and confidence intervals at 95%. Results: the secundary attack rate was 11.3% (95% CI 9.9 to 12.7) within the household. The number of household contacts was the main factor associated with the transmission (OR: 5,02 CI95% 1,78-14,13). Conclussion: The factor most associated with the generation of secondary cases is the family size, being greater the larger the group of cohabiting, which is consistent with the data provided byWHO.

Translated title of the contributionFactors associated with household transmission of Influenza (H1N1) 2009
Original languageSpanish
Pages (from-to)57-62
Number of pages6
JournalRevista Espanola de Salud Publica
Issue number1
StatePublished - Jan 2011
Externally publishedYes


  • Human influenza
  • Infectious disease transmission

ASJC Scopus subject areas

  • Medicine(all)


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