Rotavirus is surging again across the country, hitting infants and young children hardest and forcing more families into emergency care; this article explains what’s likely driving the rise, how the infection spreads, what treatment looks like, and why vaccination and basic hygiene remain the best defenses.
Rotavirus is a highly contagious double-stranded RNA virus that causes acute gastroenteritis, bringing severe diarrhea, vomiting, fever and stomach pain to affected patients. Young children bear the brunt of the illness, though outbreaks can occur in older adults, especially in communal settings like nursing homes.
Recent surveillance shows an uptick in positive test rates even as overall testing has declined, a worrying signal that the virus is circulating more than many parents realize. “We’re seeing a lot of rotavirus in the wastewater right now,” Dr. Marc Siegel confirmed. “Testing for rotavirus is way down, but the percentage of positive tests is up.”
Experts point to falling vaccine coverage among infants and toddlers as a central factor in the current surge. “Vaccine rates are down overall among young children, as they decreased during COVID,” Patricia Pinto-Garcia, M.D., said, and lower uptake leaves a growing pool of susceptible kids.
“Children who haven’t finished the vaccine series yet, are too young to get vaccinated, or can’t get the vaccine due to medical illness are more likely to get exposed to the illness because other children aren’t vaccinated,” she said, explaining how gaps in coverage break down community protection. Before vaccines existed, rotavirus caused tens of thousands of hospital visits annually, illustrating how powerful immunization has been.
Surveillance has improved, which helps detect outbreaks earlier and more accurately, but higher healthcare visits tied to rotavirus show detection alone does not explain the spike. “But we see that rotavirus-related healthcare visits are also up, so improved detection is not the only reason we are seeing this spike,” she said, underscoring that real increases in disease are occurring.
The pandemic also scrambled the usual seasonal patterns for many infections, making year-to-year comparisons tricky. “It’s possible that what we are seeing is still some post-pandemic rebound, but it’s unlikely that this year’s pattern is fully explained by just this factor,” she added, suggesting multiple forces are at play.
Transmission is typically fecal-oral, meaning tiny virus particles from an infected person can spread via hands, surfaces or shared toys and then be ingested by another child. “Rotavirus is spread via the fecal-oral route, meaning that a person comes into contact with virus droplets from contact with other children or adults, or from contact with objects such as toys that have been contaminated with the virus from someone who is sick,” Dr. Zachary Hoy explained. “This can lead to outbreaks, especially at schools where many young children share the same toys.”
Dehydration is the biggest immediate danger with rotavirus, and young children can deteriorate quickly because they have smaller fluid reserves. “Younger children do not have the reserves that older children and adults have, so they can become more dehydrated quicker and develop more severe electrolyte imbalances, leading to more severe infections,” Hoy said, noting that immune-compromised patients can endure longer, worse illness.
“Patients with problems with their immune systems or on medications that can decrease their immune systems can have more severe and prolonged infections, too,” he added. Because this is a viral illness, antibiotics are useless, and treatment focuses on replacing lost fluids and electrolytes.
“The mainstay of treatment is hospitalization for rehydration via intravenous (IV) fluids,” Hoy told Fox News Digital. “Sometimes it can take up to two to three days of IV fluids to help get patients rehydrated.” Blood tests are often needed to check sodium, potassium, calcium and magnesium, and some children require tailored IV solutions or specific electrolyte supplements.
“If these electrolyte levels are significantly low, sometimes patients need special IV solutions or individual electrolyte medications,” he added, highlighting how supportive care can become complex depending on lab results. Parents should watch for signs of dehydration such as reduced urination, extreme sleepiness, or the inability to keep fluids down, and seek medical help when those appear.
“While rare, rotavirus can be life-threatening in vulnerable populations, especially very young infants or children with underlying medical conditions,” Dr. Daniel Park cautioned, reminding readers that vigilance matters. The best prevention remains vaccination: two main vaccines are available and are given as oral drops starting at two months of age.
“It’s important to get the rotavirus vaccines on schedule, because these younger infants are at greatest risk if they get rotavirus,” he advised, and routine handwashing with soap and water adds another layer of protection in daycare and home settings. Simple steps taken early can keep kids out of the hospital and break chains of transmission in the community.
