Household Transmission of Pandemic (H1N1) 2009, San Antonio, Texas, USA, April-May 2009

作者：Morgan Oliver W^*; Parks Sharyn; Shim Trudi; Blevins Patricia A; Lucas Pauline M; Sanchez Roger; Walea Nancy; Loustalot Fleetwood; Duffy Mark R; Shim Matthew J; Guerra Sandra; Guerra Fernando; Mills Gwen; Verani Jennifer; Alsip Bryan; Lindstrom Stephen; Shu Bo; Emery Shannon; Cohen Adam L; Menon Manoj; Fry Alicia M; Dawood Fatimah; Fonseca Vincent P; Olsen Sonja J

来源：Emerging Infectious Diseases, 2010, 16(4): 631-637.

DOI：10.3201/eid1604.091658

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 <= 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 >= 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.

• 出版日期2010-4