CDC estimates between 14 and 34 million cases of 2009 H1N1 occurred between April and October 17, 2009
CDC Estimates of 2009 H1N1 Influenza Cases, Hospitalizations and Deaths in the United States, April October 17, 2009 “When the 2009 H1N1 flu outbreak began in April 2009, CDC began reporting the number of laboratory-confirmed cases, hospitalizations and deaths associated with 2009 H1N1 flu in the United States that were reported by states to …