Ohio is experiencing an alarming surge in norovirus cases, commonly known as the “stomach flu,” with outbreaks reaching levels not seen in over a decade. Data from the Centers for Disease Control and Prevention (CDC) show that between August 1, 2024, and May 7, 2025, there were 2,571 norovirus outbreaks reported by NoroSTAT-participating states, including Ohio—almost double the number reported during the same period last year. The spike is part of a nationwide trend, but Ohio stands out for its particularly high prevalence.
What Is Norovirus and Why Is It Spreading?
Norovirus is a highly contagious virus that causes acute gastroenteritis, leading to symptoms such as vomiting, diarrhea, stomach cramps, and nausea. It is the leading cause of foodborne illness in the United States, responsible for tens of millions of cases each year.
The virus spreads easily through contaminated food or water, touching infected surfaces, or close contact with sick individuals. Outbreaks are especially common in crowded environments like schools, nursing homes, and hospitals.
This season’s surge is attributed in part to the emergence of a new dominant strain, GII.17, which has become the most detected genotype in the U.S. during the fall and winter of 2024-2025. While there is no evidence that this strain causes more severe illness, it has contributed to the increased number of outbreaks.
Ohio’s Situation: Local Data and Public Health Concerns
In Ohio, wastewater surveillance has revealed that norovirus levels are nearly three times higher than at this time last year, according to the Wheeling-Ohio County Health Department. Health officials are particularly concerned because case numbers have remained high even after the typical winter peak, suggesting the virus will continue to circulate for weeks to come…