Rotavirus Cases Rising, Young Kids at Risk

Rotavirus, a stomach virus that can cause severe vomiting and diarrhea, is running at high levels in the U.S. this April, with young children facing the greatest risk. (cdc.gov, data.wastewaterscan.org) WastewaterSCAN, a national sewage-tracking network, listed rotavirus as “high” with an upward 21-day trend on April 23, 2026. CDC says the most severe illness is usually seen in unvaccinated children ages 3 months to 3 years. (data.wastewaterscan.org, cdc.gov) Rotavirus spreads when tiny amounts of stool from an infected person get onto hands, surfaces, food, or water and then into someone else’s mouth. In the United States, it is usually most common in winter and spring, and childcare settings are a frequent place for spread. (cdc.gov, kidshealth.org) The symptoms parents are told to watch are watery diarrhea, vomiting, fever, stomach pain, and signs of dehydration. CDC lists decreased urination, dry mouth, crying with few or no tears, unusual sleepiness, and fussiness among the warning signs. (cdc.gov) Infants and toddlers get into trouble fastest because fluid loss can build quickly after repeated vomiting and diarrhea. Before vaccines were introduced in 2006, rotavirus sent 55,000 to 70,000 U.S. children to hospitals each year and caused more than 200,000 emergency room visits. (cdc.gov) The vaccine changed that pattern. CDC says rotavirus vaccination now prevents an estimated 40,000 to 50,000 hospitalizations among U.S. infants and young children each year. (cdc.gov) Two oral rotavirus vaccines are used in the United States, and both are given in early infancy, not later in childhood. CDC says the first dose must be given before 15 weeks of age, and all doses must be finished before 8 months. (cdc.gov, cdc.gov) For families trying to tell rotavirus from a routine “stomach bug,” doctors look less at the label than at the child’s hydration and energy level. A baby with fewer wet diapers, no tears, a dry mouth, or unusual sleepiness needs medical attention faster than a child with a mild, short-lived stomach illness. (cdc.gov, mayoclinic.org) The immediate playbook is basic but time-sensitive: wash hands after diaper changes and bathroom trips, clean contaminated surfaces, keep sick children home from childcare, and call a clinician if dehydration signs appear. With rotavirus trending up in late April, the youngest children remain the group doctors watch most closely. (cdc.gov, washington.edu, data.wastewaterscan.org)