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
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (A.J. Hall, V.G. Eisenbart, A. Lehman Etingüe, L.H. Gould, B.A. Lopman, U.D. Parashar); University of Illinois, Urbana, Illinois, USA (V.G. Eisenbart); and North Carolina State University, Raleigh, North Carolina, USA (A. Lehman Etingüe)
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.
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