Hong Kong Respiratory Medicine

Anthony E. Fiore, MD, MPH; Kathleen M. Neuzil, MD, MPH. JAMA. 2010;303(1):73-74. Published online December 21, 2009
The 2009 influenza A(H1N1) virus was first identified 8 months ago,1 but the virus has already had a substantial effect on human health. Influenza activity in the United States has remained higher than normal since May, and measures of severe illness such as hospitalizations and deaths during the summer and fall have been equal to or higher than rates usually observed in a typical winter influenza season in all age groups except older adults.2

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