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Clin Infect Dis. 2011 Sep;53(6):568-71. doi: 10.1093/cid/cir478. Epub 2011 Aug 10.

Impact of an emergent norovirus variant in 2009 on norovirus outbreak activity in the United States.

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  • 1Epidemic Intelligence Service Centers for Disease Control and Prevention, Atlanta, Georgia 30333, USA.


In October 2009, a new genogroup II, type 4 (GII.4) norovirus variant was identified in the United States. We collected norovirus outbreak data from 30 states to assess whether this new strain was associated with increased acute gastroenteritis activity. No increase in norovirus outbreaks was observed during the 2009-2010 winter.

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