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Household transmission of pandemic (H1N1) 2009, San Antonio, Texas, USA, April-May 2009



Household transmission of pandemic (H1N1) 2009, San Antonio, Texas, USA, April-May 2009



Emerging Infectious Diseases 16(4): 631-637



To assess household transmission of pandemic (H1N1) 2009 in San Antonio, Texas, USA, during April 15-May 8, 2009, we investigated 77 households. The index case-patient was defined as the household member with the earliest onset date of symptoms of acute respiratory infection (ARI), influenza-like illness (ILI), or laboratory-confirmed pandemic (H1N1) 2009. Median interval between illness onset in index and secondary case-patients was 4 days (range 1-9 days); the index case-patient was likely to be < or =18 years of age (p = 0.034). The secondary attack rate was 4% for pandemic (H1N1) 2009, 9% for ILI, and 13% for ARI. The secondary attack rate was highest for children <5 years of age (8%-19%) and lowest for adults > or =50 years of age (4%-12%). Early in the outbreak, household transmission primarily occurred from children to other household members and was lower than the transmission rate for seasonal influenza.

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Accession: 053586203

Download citation: RISBibTeXText

PMID: 20350377

DOI: 10.3201/eid1604.091658


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