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Cases were defined as either a fourfold increase in the serological titer or a laboratory\u2010confirmed <jats:styled-content style=\"fixed-case\">H<\/jats:styled-content>1<jats:styled-content style=\"fixed-case\">N<\/jats:styled-content>1pdm09 on a nasal swab, with either <jats:styled-content style=\"fixed-case\">RT<\/jats:styled-content>\u2010<jats:styled-content style=\"fixed-case\">PCR<\/jats:styled-content> or multiplex <jats:styled-content style=\"fixed-case\">PCR<\/jats:styled-content>. Risk factors for <jats:styled-content style=\"fixed-case\">H<\/jats:styled-content>1<jats:styled-content style=\"fixed-case\">N<\/jats:styled-content>1pdm09 infections were explored, without any pre\u2010specified hypothesis, among 167 individual, collective and environmental covariates via generalized estimating equations modeling. We adopted a multimodel selection procedure to control for model selection uncertainty.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>This analysis is based on a sample size of 1121 subjects. The final multivariable model identified one risk factor (history of asthma, <jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>\u00a0=\u00a02\u00b717; 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>: 1\u00b702\u20134\u00b762) and three protective factors: pre\u2010epidemic serological titer (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>\u00a0=\u00a00\u00b751 per doubling of the titer; 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>: 0\u00b739\u20130\u00b767), green tea consumption a minimum of two times a week (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>\u00a0=\u00a00\u00b739; 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>: 0\u00b718\u20130\u00b784), and proportion of subjects in the household always covering their mouth while coughing\/sneezing (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>\u00a0=\u00a00\u00b793 per 10% increase; 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>: 0\u00b786\u20131\u00b700).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>This exploratory study provides further support of previously reported risk factors and highlights the importance of collective protective behaviors in the household. Further analyses will be conducted to explore these findings.<\/jats:p><\/jats:sec>","DOI":"10.1111\/irv.12294","type":"journal-article","created":{"date-parts":[[2014,12,13]],"date-time":"2014-12-13T09:41:15Z","timestamp":1418463675000},"page":"43-50","source":"Crossref","is-referenced-by-count":14,"title":["Risk factors of pandemic influenza <scp>A<\/scp>\/<scp>H<\/scp>1<scp>N<\/scp>1 in a prospective household cohort in the general population: results from the <scp>C<\/scp>o<scp>P<\/scp>an<scp>F<\/scp>lu\u2010<scp>F<\/scp>rance cohort"],"prefix":"10.1111","volume":"9","author":[{"given":"Rosemary M.","family":"Delabre","sequence":"first","affiliation":[{"name":"INSERM UMR_S 1136 Institut Pierre Louis d'Epid\u00e9miologie et de Sant\u00e9 Publique Paris France"},{"name":"Sorbonne Universit\u00e9s UPMC Univ Paris 06 UMR_S 1136 Institut Pierre Louis d'Epid\u00e9miologie et de Sant\u00e9 Publique Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4837-1068","authenticated-orcid":false,"given":"Nathanael","family":"Lapidus","sequence":"additional","affiliation":[{"name":"INSERM UMR_S 1136 Institut Pierre Louis d'Epid\u00e9miologie et de Sant\u00e9 Publique Paris France"},{"name":"Sorbonne Universit\u00e9s UPMC Univ Paris 06 UMR_S 1136 Institut Pierre Louis d'Epid\u00e9miologie et de Sant\u00e9 Publique Paris France"},{"name":"Department of Public Health H\u00f4pital Saint\u2010Antoine AP\u2010HP Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicolas","family":"Salez","sequence":"additional","affiliation":[{"name":"UMR_D 190 \u201cEmergence des Pathologies Virales\u201d IRD French Institute of Research for Development EHESP French School of Public Health Aix\u2010Marseille University Marseille France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yohann","family":"Mansiaux","sequence":"additional","affiliation":[{"name":"INSERM UMR_S 1136 Institut Pierre Louis d'Epid\u00e9miologie et de Sant\u00e9 Publique Paris France"},{"name":"Sorbonne Universit\u00e9s UPMC Univ Paris 06 UMR_S 1136 Institut Pierre Louis d'Epid\u00e9miologie et de Sant\u00e9 Publique Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xavier","family":"de Lamballerie","sequence":"additional","affiliation":[{"name":"UMR_D 190 \u201cEmergence des Pathologies Virales\u201d IRD French Institute of Research for Development EHESP French School of Public Health Aix\u2010Marseille University Marseille France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fabrice","family":"Carrat","sequence":"additional","affiliation":[{"name":"INSERM UMR_S 1136 Institut Pierre Louis d'Epid\u00e9miologie et de Sant\u00e9 Publique Paris France"},{"name":"Sorbonne Universit\u00e9s UPMC Univ Paris 06 UMR_S 1136 Institut Pierre Louis d'Epid\u00e9miologie et de Sant\u00e9 Publique Paris France"},{"name":"Department of Public Health H\u00f4pital Saint\u2010Antoine AP\u2010HP Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2014,12,13]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature04795"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1097\/EDE.0b013e31825588b8"},{"key":"e_1_2_9_4_1","doi-asserted-by":"crossref","DOI":"10.2807\/ese.16.03.19765-en","article-title":"Secondary attack rate of pandemic influenza A(H1N1) 2009 in Western Australian households, 29 May\u20137 August 2009","volume":"16","author":"Carcione D","year":"2011","journal-title":"Euro Surveill"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1008895108"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/irv.12129"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.7326\/0003-4819-151-7-200910060-00142"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0075339"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2458-12-417"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0060127"},{"key":"e_1_2_9_11_1","unstructured":"Sentiweb.Sentinelles network France \u2013 weekly epidemiological record. n.d. 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