Suspected and Confirmed Norovirus Outbreaks Reported by State Health Departments in Minnesota, Ohio, Oregon, Tennessee, and Wisconsin to the National Outbreak Reporting System (NORS) by Week of Illness Onset, 2009-2015*.
*Incomplete outbreak data from 2009-12 was supplemented with information from state health department records.
- Page last reviewed: October 21, 2014
- Page last updated: October 21, 2014
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