Conclusion
The data and biological samples collected within the CoPanFlu-France cohort study have allowed a comprehensive analysis of the determinants of H1N1pdm09 infection during the 2010–2011 season within households in the general population. The broad scope of this exploratory analysis has permitted to identify factors expected from previously reported studies (pre-epidemic serologic titer, asthma, and green tea) and to highlight the potential importance of collective preventive behaviors in the household, including the proportion of household covering their mouth when coughing which was associated with H1N1pdm09 in the final multivariable model. Additional analyses are being conducted for this household cohort whose follow-up ended in late 2012 to provide complimentary insights for investigating risk factors of infectious disease.