With infection rates higher now than this time last year, doctors have fresh concerns that declining Rotavirus, a seasonal virus similar to influenza, has been rising across the U.S. since January. vaccinations could lead to more severe illness and a higher surge in the coming years.

The virus — which is spread by hands touching an infected surface, then touching the mouth — used to be a major cause of severe illness among babies and young children in the U.S., responsible for more than 200,000 emergency room visits, up to 70,000 hospitalizations and dozens of deaths each year, according to the National Foundation for Infectious Diseases. That drastically changed after the first oral vaccine was approved 20 years ago.

Data from WastewaterScan, an academic program through Stanford University in partnership with Emory University, shows the virus has been surging since January, with levels continuing to increase in certain parts of the U.S., including the West and the Midwest.

“We’re seeing a lot of rotavirus in wastewater right now, definitely very high levels and that indicates to us that there are high levels of rotavirus infections in these communities,” said Dr. Marlene Wolfe, WastewaterScan's program director and co-principal investigator.

Story Date: April 27, 2026