Norovirus Outbreaks on the Rise Across the U.S.

This winter, norovirus cases are climbing in the United States, with a sharp increase in reported outbreaks compared to previous years. Data from the Centers for Disease Control and Prevention (CDC) shows 91 outbreaks during the week of December 5, a significant jump from 69 outbreaks in late November. For perspective, the same period in past years rarely exceeded 65 outbreaks.

Norovirus, commonly known as the “stomach flu,” is notorious for causing sudden bouts of vomiting and diarrhea. It spreads rapidly in settings where people are in close contact, such as nursing homes, schools, jails, and cruise ships. This highly contagious virus can infect individuals with just 10 viral particles.

Annually, the United States sees around 2,500 norovirus outbreaks, peaking from November through April. Along with gastrointestinal symptoms, people may experience nausea, stomach pain, fever, headaches, and body aches. Most recover within one to three days, but the virus still causes approximately 109,000 hospitalizations and 900 deaths each year, mainly among older adults and young children.

There is no specific treatment for norovirus. Managing dehydration is crucial, with water and electrolyte-rich drinks being the best remedies—though alcohol, coffee, and tea should be avoided. Severe dehydration, marked by symptoms like reduced urination, dry mouth, and dizziness, may require medical attention.

Preventing norovirus hinges on proper hygiene. Frequent handwashing with soap and warm water for at least 20 seconds, especially before eating, is essential.

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