Surveillance of Norovirus Outbreaks
Figure 1
Figure 1: Outbreaks of Acute Gastroenteritis, 30 States, January 2007 through April 2010. On average, there were nearly 3 times as many norovirus outbreaks (143 per month) as non-norovirus outbreaks (50 per month) and the number of norovirus outbreaks increased dramatically during the winter months. A new virus strain (GII.4 New Orleans) that first appeared in October 2009 did not lead to more outbreaks.”
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