Rotavirus is rising in California and across the United States, with the Bay Area emerging as a major hotspot in wastewater surveillance and high levels reported in every region except the Midwest. Numbers have been climbing steadily nationwide since mid-December, according to CDC tracking that now covers 40 states.
The pattern matters because rotavirus is extremely contagious and can be fatal without vaccine protection, especially for infants and young children under the age of 5. Before the vaccine arrived in the 1990s, the virus was the leading cause of severe diarrhea among infants and young children in the U.S., causing as many as 2.7 million cases and far more deaths than the 20 to 40 reported each year now.
The wastewater signals are not limited to California. High levels have also been detected at treatment plants in New Jersey, Connecticut and along the Northeast coast, showing a broader surge that public health officials can see before hospital systems feel it fully. Rotavirus spreads through infected fecal matter particles, either through direct contact with infected people or by touching contaminated surfaces, which makes rapid spread hard to stop once it starts moving through communities.
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Symptoms can last 3 to 8 days and include vomiting, watery diarrhea, fever, abdominal pain, dehydration and loss of appetite. The first infection tends to cause the worst illness, which is one reason pediatricians have long pushed vaccination so aggressively. Dr. Yvonne Maldonado has said people tend to think diarrheal disease is not a big deal, but rotavirus can be very severe in infants and young children.
That warning lands against a sharp policy fight. The administration now says parents should decide with their doctors whether rotavirus vaccines are right for their children, replacing previous CDC guidance that said all children should get the shots. Changes to vaccine recommendations were temporarily blocked in court last month, but experts have argued that weakening the recommendation could undo years of progress. Dr. Sean O’Leary warned that such changes would bring back suffering and death, and said he did not mean that as hyperbole.
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For California families, the immediate answer is clear: the surge is already here, and the vaccine remains the strongest protection against a virus that still hits babies and toddlers hardest. The larger question is whether the country keeps the guidance that helped push rotavirus from a leading pediatric killer to a much smaller annual toll, or whether the current rise becomes the first sign that old dangers are returning.
