Comparison of patients hospitalized with pandemic 2009 influenza A (H1N1) virus infection during the first two pandemic waves in Wisconsin.
J Infect Dis 203(6):828-37 (2011) PMID 21278213 PMCID PMC3071126
Wisconsin was severely affected by pandemic waves of 2009 influenza A H1N1 infection during the period 15 April through 30 August 2009 (wave 1) and 31 August 2009 through 2 January 2010 (wave 2).
DOI: 10.1093/infdis/jiq117
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