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

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.

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

Published Date:

Apr 2010

Source:

Emerg Infect Dis. 16(4):631-637.

[PDF - 252.59 KB]

Details:

Personal Authors:

Morgan, Oliver W. ; Parks, Sharyn ; Shim, Trudi ; Blevins, Patricia A. ; Lucas, Pauline M. ; ... More ▼

Keywords:

[+]

Description:

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.

Document Type:

Journal Article

Collection(s):

CDC Public Access
Emerging Infectious Diseases

Supporting Files:

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