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Seasonal distribution of NoV outbreaks by month (all [n = 708], GI [n = 119], other GII [n = 299], and GII.4 [n = 290]) reported to the CDC from 1994 to 2006. The months are indicated by the numbers 1 to 12 below the graph (e.g., 1 for January, 2 for February, etc.).
