Volume 11, Number 1—January 2005
Norovirus and Foodborne Disease, United States, 1991–2000
1Efforts in 1998 to improve outbreak reporting resulted in more outbreaks being retrospectively attributed to this period. The current figures for 1993 to 1997 are 65 (2%) of 3,257 outbreaks attributable to NoV and 67% of unknown etiology.
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