Volume 18, Number 10—October 2012
CME ACTIVITY
Epidemiology of Foodborne Norovirus Outbreaks, United States, 2001–2008
Aron J. Hall
, Valerie G. Eisenbart, Amy Lehman Etingüe, L. Hannah Gould, Ben A. Lopman, and Umesh D. Parashar
, Valerie G. Eisenbart, Amy Lehman Etingüe, L. Hannah Gould, Ben A. Lopman, and Umesh D. ParasharTable 1
Estimated annual number and rate of reported illnesses associated with foodborne norovirus outbreaks by age, sex, and outcome, United States, 2001–2008
| Characteristic |
Estimated annual outbreak-associated illnesses*
|
|
|---|---|---|
| No. (%) | Rate† | |
| Age group, y | ||
|
<5 |
215 (2) | 10.6 |
|
5–19 |
1,827 (18) | 30.3 |
|
20–49 |
4,923 (48) | 39.8 |
|
>50 |
3,359 (33) | 37.7 |
| Sex | ||
|
F |
5,819 (56) | 39.0 |
|
M |
4,505 (44) | 31.3 |
| Outcome | ||
|
Health care provider visit |
1,247 (12) | 4.3 |
|
Hospitalization |
156 (1.5) | 0.5 |
|
Death |
1 (0.01) | 0.002 |
| Total Illnesses | 10,324 (100) | 35.2 |
*Proportions of illnesses by age, sex, and outcomes among outbreaks for which such data were reported were extrapolated to all reported foodborne norovirus outbreak–associated illnesses.
†Reported rate per 1,000,000 person-years calculated by dividing the number of illnesses by the corresponding US intercensal estimate at the study period midpoint (July 2004) (23).
