An outbreak of 2009 pandemic influenza A (H1N1) virus infection in an elementary school in Pennsylvania.
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Clin Infect Dis. 2011 Jan 1;52 Suppl 1(Suppl 1):S154-60. doi: 10.1093/cid/ciq058.
Clin Infect Dis. 2011.
PMID: 21342888
Free PMC article.