Rotavirus circulates every year in the United States, with activity typically picking up in late fall and peaking through winter and early spring. The timing shifts by region: outbreaks historically begin in the Southwest around November and December, then move across the country, reaching the Northeast by April and May. If you’re hearing about stomach bugs in your community during this window, rotavirus is a likely culprit, especially among young children.
The CDC tracks rotavirus through a network of participating laboratories that report weekly test numbers and positivity rates. That data, now hosted on the NREVSS Interactive Dashboard, is the best real-time indicator of how active the virus is in your region at any given moment.
Why Rotavirus Follows a Seasonal Pattern
Unlike some viruses that spike in summer, rotavirus thrives in cooler, drier conditions. It is extraordinarily hardy outside the body, remaining viable on surfaces for weeks or even months without disinfection. That durability means it spreads easily through daycares, schools, and households once cold weather pushes people indoors and into closer contact. Even in years when overall case counts are lower thanks to vaccination, the seasonal rhythm holds: late fall through spring is rotavirus season.
How It Spreads and How Long You’re Contagious
Rotavirus spreads through the fecal-oral route. In practical terms, that means contaminated hands, shared toys, changing tables, and surfaces in bathrooms and kitchens. A tiny amount of virus is enough to cause infection, and an infected person sheds enormous quantities of it in their stool.
The contagious window is longer than most people expect. A person can spread the virus for one to three weeks, which means someone can still be infectious well after their symptoms have cleared. This is a major reason outbreaks move so quickly through families and childcare settings. Careful handwashing after every diaper change and bathroom visit is the single most effective way to slow transmission, but even meticulous hygiene isn’t foolproof given how resilient the virus is.
What Rotavirus Feels Like
The hallmark of rotavirus is sudden, watery diarrhea combined with vomiting, fever, and stomach pain. In young children, the vomiting often hits first, followed by several days of frequent diarrhea. Most healthy children recover within three to eight days, but those days can be intense. The biggest danger isn’t the virus itself; it’s dehydration from the sheer volume of fluid lost.
Adults can catch rotavirus too, though symptoms tend to be milder. You might mistake it for generic food poisoning or a “stomach flu.” Adults are more likely to brush it off, but they can still spread it to vulnerable children in the household.
Dehydration Signs to Watch For
In babies and toddlers, dehydration can develop quickly. The signs to look for include crying without producing tears, no wet diapers for three or more hours, a dry mouth, sunken eyes or cheeks, and unusual sleepiness or fussiness. In infants, a sunken soft spot on top of the head is a particularly telling sign. If you gently pinch the skin on the back of your child’s hand and it doesn’t spring back right away, that loss of elasticity signals significant fluid loss.
Fluids That Help (and Ones That Don’t)
Oral rehydration solutions like Pedialyte are specifically designed to replace the sodium, potassium, and glucose that diarrhea strips from the body. They work far better than the “clear liquids” many parents reach for instinctively. Soda, apple juice, Jell-O, and sports drinks contain too much sugar and too little sodium, which can actually worsen diarrhea by pulling more water into the gut. If your child is keeping fluids down, small frequent sips of an oral rehydration solution are the gold standard.
For older children who are eating, plain foods are fine to continue. There’s no need to starve the illness out. Avoid anything high in simple sugars, including presweetened cereals and fruit juices, until the diarrhea resolves.
How Vaccination Changed the Picture
Rotavirus vaccines, given as oral drops in two or three doses starting at two months of age, have dramatically reduced the burden of severe disease. Globally, hospitalizations and emergency department visits due to rotavirus dropped by a median of 67% in countries that introduced the vaccine. In low-mortality countries like the United States, the reduction in rotavirus-specific hospitalizations reached about 71%.
That doesn’t mean the virus has disappeared. Vaccinated children can still get infected, though their illness is typically shorter and less severe. Unvaccinated children remain at full risk, and rotavirus still kills hundreds of thousands of children globally each year, overwhelmingly in countries without widespread vaccine access.
Cleaning Surfaces During an Outbreak
Standard soap and many common household cleaners don’t reliably kill rotavirus. The virus is resistant to most alcohol-based hand sanitizers as well. For surfaces like changing tables, countertops, and bathroom fixtures, a bleach solution (one part bleach to nine parts water) left on the surface for 10 to 20 minutes is effective. Handwashing with soap and running water, scrubbing for at least 20 seconds, remains more reliable than sanitizer for hands. Wash contaminated clothing and linens in hot water promptly, and keep sick family members’ towels and utensils separate until they’ve been symptom-free for at least 48 hours.