Volume 18, Number 10—October 2012
CME ACTIVITY - Research
Epidemiology of Foodborne Norovirus Outbreaks, United States, 2001–2008
Figure 2

Figure 2. . . . . . Number of reported foodborne norovirus outbreaks by month of first illness onset, United States, 2001–2008. Outbreaks are confirmed as caused by norovirus if fecal or vomitus specimens from >2 persons are positive for the virus by reverse transcription PCR, electron microscopy, or enzyme immunoassay.