"At the June 25, 2009 Advisory Committee on Immunization Practice Meeting, CDC estimated that there have been at least 1 million cases of pandemic H1N1 in the United States to date. This estimate is derived from population-based surveys in areas with focal outbreaks of pandemic H1N1 that have reported the incidence of influenza-like-illness to be approximately 6%.
On June 10, 2009, the New York City Health Department released preliminary findings from a household survey suggesting that 6.9% of New Yorkers may have experienced flu-like illness between May 1 and May 20, 2009.
Several other local population-based surveys produced similar estimates of ILI incidence/pandemic H1N1 incidence.
Given the occurrence of pandemic H1N1 outbreaks in cities with large populations and the results of these surveys, CDC estimates that there have been at least 1 million cases of pandemic H1N1 in the United States."
Source: CDC Joint Information Center
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