National Norovirus Activity Has Remained Low

As the fall season begins, experts anticipate a rise in virus levels starting in October.

Updated on Sept. 22, 2026 in COVID-19

Bold vector editorial illustration of a porcelain sink, silver faucet, and liquid soap, representing health hygiene and preventive care. — National norovirus activity remains low as of early September, though public health experts expect cases to climb as the winter season approaches. AI Illustration. Upload story photo >

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Nationwide norovirus activity has held at low levels as of early September. While wastewater concentrations dropped 12% in August, seasonal trends suggest a steady increase in cases will begin next month.

Why it matters

Norovirus is highly contagious and causes up to 21 million illnesses annually in the U.S. Monitoring these early trends helps the public prepare for the anticipated winter peak in February.

The CDC NoroSTAT tracker identified 27 outbreaks between Aug. 1 and Sept. 4, while median wastewater concentrations fell 12% in August compared to July. The virus is responsible for an estimated 19 million to 21 million annual illnesses and roughly 900 deaths nationwide.

The players

Centers for Disease Control and Prevention

The national public health agency monitors domestic outbreak data through programs like NoroSTAT.

WastewaterSCAN

This monitoring program analyzes sewage samples to track the presence and concentration of viruses across the country.

The details

The virus spreads easily through tiny particles of stool or vomit and can be shed by infected individuals for two weeks or more after symptoms resolve. Public health officials emphasize that soap and water remain significantly more effective at removing the virus than alcohol-based hand sanitizers.

Aug. 1 to Sept. 4, 2026: The CDC NoroSTAT tracked 27 norovirus outbreaks.
October 2026: An anticipated seasonal rise in virus levels is expected to begin.
February 2027: National norovirus activity is projected to reach its annual peak.

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The Big Picture

Current low levels of viral activity mark the expected baseline period prior to the historical winter norovirus peak. This follows a established pattern where transmission significantly increases as temperatures drop and indoor gatherings become more frequent.

To prevent infection, wash hands thoroughly with soap and water as it is more effective against norovirus than alcohol-based sanitizers. Those who have recently been ill should be aware that they can shed the virus for two weeks or more after their symptoms resolve.

The takeaway

Norovirus remains a persistent public health challenge that typically intensifies during the winter months. Maintaining consistent hygiene practices is the most reliable way to mitigate risk as national case numbers begin their seasonal climb.