Suspected and Confirmed Norovirus Outbreaks Reported by State Health Departments in Massachusetts, Michigan, Minnesota, Ohio, Oregon, South Carolina, Tennessee, Virginia, and Wisconsin to the National Outbreak Reporting System (NORS) by Week of Illness Onset, 2009-2016*†.
*Incomplete outbreak data from 2009-12 was supplemented with information from state health department records.
†Michigan and South Carolina joined the NoroSTAT network at the start of the 2015-16 reporting season; 2009-15 data from these states has been added for comparison.
‡Massachusetts and Virginia joined the NoroSTAT network at the start of the 2016-17 reporting season; 2009-16 data from these states has been added for comparison.
- Page last reviewed: June 24, 2016
- Page last updated: January 18, 2017
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