NoroSTAT Data Table

Key points

• The table shows data on suspected and confirmed norovirus outbreaks reported to CDC by NoroSTAT-participating state health departments.
• States report data through the National Outbreak Reporting System (NORS).
• Outbreaks in the data table are classified by week of illness onset and updated monthly.

Data table

Norovirus Outbreaks Reported by State Health Departments by Week of Illness Onset, 2012–2027

Table notes

The NoroSTAT network includes Colorado, Michigan, Minnesota, Nebraska, New Hampshire, North Carolina, Ohio, Oregon, South Carolina, Tennessee, Virginia, and Wisconsin.

• Michigan and South Carolina joined the NoroSTAT network at the start of the 2015-16 seasonal year; 2012-15 data from these states were added for comparison.
• Virginia joined the NoroSTAT network at the start of the 2016-17 seasonal year; 2012-16 data from this state were added for comparison.
• Nebraska joined the NoroSTAT network at the start of the 2019-20 seasonal year; 2012-2019 data from this state were added for comparison.
• North Carolina joined the NoroSTAT network at the start of the 2022-23 seasonal year; 2012-2022 data from this state were added for comparison.
• Colorado joined the NoroSTAT network at the start of the 2023-24 seasonal year; 2012-2023 data from this state were added for comparison.
• **New Hampshire **joined the NoroSTAT network at the start of the 2025-26 seasonal year; 2012-2025 data from this state were added for comparison.

Data from the NoroSTAT network are typically released online on a monthly basis.

On This Page

• Data table
• Table notes

Sept. 17, 2026

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National Center for Immunization and Respiratory Diseases; Division of Viral DiseasesAbout This Page

Published: May 15, 2024

Updated: September 17, 2026This page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.

Reviewed: September 17, 2026The information on this page was last reviewed by subject matter experts to ensure accuracy.

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