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Household Transmission of 2009 Influenza A (H1N1) Virus after a School‐Based Outbreak in New York City, April–May 2009
In April 2009, an outbreak due to infection with the 2009 pandemic influenza A (H1N1) virus (pH1N1) was investigated in a New York City high school. We surveyed household contacts of ill students to characterize the extent of transmission within households, identify contact groups at highest risk for illness, and …