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Background

Households play a major role in community spread of influenza and are potential targets for mitigation strategies.

Methods

We enrolled and followed 328 households with children during the 2010-2011 influenza season; this season was characterized by circulation of influenza A H3N2, A H1N1pdm09 and type B viruses. Specimens were collected from subjects with acute respiratory illnesses and tested for influenza in real-time reverse transcriptase polymerase chain reaction RT-PCR assays. Influenza cases were classified as community-acquired or household-acquired, and transmission parameters estimated.

Results

Influenza was introduced to 78 24% households and transmission to exposed household members was documented in 23 households. Transmission was more likely in younger households mean age <22 years and those not reporting home humidification, but was not associated with household vaccination coverage. The secondary infection risk overall 9.7% was highest among young children <9 years and varied substantially by influenza type-subtype with the highest risk for influenza A H3N2. The serial interval overall 3.2 days also varied by influenza type and was longest for influenza B. Duration of symptomatic illness was shorter in children compared with adults, and did not differ by influenza vaccination status.

Discussion

Prospective study of households with children over a single influenza season identified differences in household transmission by influenza type-subtype, subject age, and home humidification, suggesting possible targets for interventions to reduce transmission.



Autor: Joshua G. Petrie, Suzanne E. Ohmit , Benjamin J. Cowling, Emileigh Johnson, Rachel T. Cross, Ryan E. Malosh, Mark G. Thompson, Ar

Fuente: http://plos.srce.hr/



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