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. 2009 Dec;15(12):2004-7.
doi: 10.3201/eid1512.091413.

Estimates of the prevalence of pandemic (H1N1) 2009, United States, April-July 2009

Carrie Reed  1 , Frederick J Angulo, David L Swerdlow, Marc Lipsitch, Martin I Meltzer, Daniel Jernigan, Lyn Finelli
Affiliations

Estimates of the prevalence of pandemic (H1N1) 2009, United States, April-July 2009

Carrie Reed et al. Emerg Infect Dis. 2009 Dec.

Abstract

Through July 2009, a total of 43,677 laboratory-confirmed cases of influenza A pandemic (H1N1) 2009 were reported in the United States, which is likely a substantial underestimate of the true number. Correcting for under-ascertainment using a multiplier model, we estimate that 1.8 million-5.7 million cases occurred, including 9,000-21,000 hospitalizations.

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Figures

Figure
Figure
Schematic of the steps involved in adjusting counts of reported cases of pandemic (H1N1) 2009 to estimate total cases.
See this image and copyright information in PMC

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