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Volume 15, Number 12—December 2009
Dispatch

Estimates of the Prevalence of Pandemic (H1N1) 2009, United States, April–July 2009

Carrie ReedComments to Author , Frederick J. Angulo, David L. Swerdlow, Marc Lipsitch, Martin I. Meltzer, Daniel B. Jernigan, and Lyn Finelli
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (C. Reed, F.J. Angulo, D.L. Swerdlow, M.I. Meltzer, D. Jernigan, L. Finelli); Harvard School of Public Health, Boston, Massachusetts, USA (M. Lipsitch)

Main Article

Table 2

Estimates of pandemic (H1N1) 2009–related cases and rates of illness and hospitalization by age distribution of confirmed case-patients, United States, April–July 2009

Parameter Estimated no. case-patients
 Estimated rate/100,000*
Median 90% range Median 90% range
Total no. case-patients by age group, y† 3,052,768 1,831,115–5,720,928 997 598–1,868
0–4 397,033 238,149–744,045 1,870 1,122–3,505
5–24 1,820,284 1,091,845–3,411,237 2,196 1,317–4,115
25–49 612,862 367,608–1,148,511 577 346–1,081
50–64 180,297 108,146–337,879 319 192–599
>65
 42,292
 25,368–79,256
107
 64–201
No. hospitalized case-patients by age group, y 13,764 9,278–21,305 4.5 3.0–7.0
0–4 2,768 1,866–4,285 13.0 8.8–20.2
5–24 4,991 3,364–7,725 6.0 4.1–9.3
25–49 3,440 2,319–5,324 3.2 2.2–5.0
50–64 1,912 1,289–2,959 3.4 2.3–5.2
>65
 654
 441–1,012
1.7
 1.1–2.6
Multiplier
Hospitalized 2.7 1.7–4.5 – –
Nonhospitalized 79 47–148 – –
Through May 12 33 23–49 – –
After May 12 84 50–163 – –

*United States Population Estimates, 2009.
†Age distributions from line list and aggregate reports of laboratory-confirmed cases and hospitalizations to the Centers for Disease Control and Prevention through July 23, 2009.

Main Article

Page created: December 09, 2010
Page updated: December 09, 2010
Page reviewed: December 09, 2010
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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