Rising Rotavirus Cases in Northern California
Recent reports indicate that a dangerous virus, responsible for fever, vomiting, and severe diarrhea, is spreading rapidly among young children in Northern California.
Data from WastewaterSCAN, which tracks virus levels in wastewater, reveals high rotavirus rates in areas including Davis, Marin, Redwood City, San Jose, and Fremont. Moderate levels are noted in San Francisco, Sunnyvale, and Novato. This virus primarily affects infants and toddlers aged 3 to 35 months, leading to severe dehydration, potential hospitalization, or even death, according to the Centers for Disease Control and Prevention (CDC).
“It’s highly contagious,” remarked Dr. Monica Gandhi, an infectious disease specialist at UC San Francisco, highlighting that rotavirus, while sometimes overlooked, is a significant gastrointestinal concern. Around 50,000 children in the U.S. are hospitalized due to it each year, as UCSF suggests.
Similar to norovirus—often called the “stomach flu”—rotavirus brings about familiar symptoms such as watery diarrhea, vomiting, fever, and stomach pain. It commonly spreads in crowded places like hospitals and daycare centers. The virus tend to proliferate from January to June and is transmitted through the fecal-oral route. For instance, if someone touches contaminated stool and then their mouth, they might catch it. Additionally, sharing food with infected individuals or touching contaminated surfaces can lead to infection. Interestingly, individuals are most contagious when they show symptoms, but the virus can still be spread for up to three days after recovery.
A nonprofit health organization, PATH, emphasizes that “rotavirus is the leading cause of severe and fatal diarrhea in young children worldwide, but vaccines can stop this deadly disease.”
The CDC urges vaccination against rotavirus, as relying solely on handwashing may not be sufficient to prevent its spread. They recommend that “most infants” receive the vaccine to shield them from this “potentially serious disease.”
Before vaccines became available in 2006, the California Department of Public Health notes that rotavirus was a leading cause of severe diarrhea in U.S. infants and young children. Globally, it remains a major contributor to childhood mortality.
Currently, CDC estimates indicate that about 75% of children in the U.S. complete their rotavirus vaccinations. However, recent actions by the Department of Health and Human Services, influenced by vaccine skeptic Robert F. Kennedy Jr., may hinder vaccination rates.
Earlier this year, the acting CDC director revised the recommendations for childhood vaccinations, moving away from a one-size-fits-all approach for the rotavirus vaccine. Now, they advise parents to engage in “shared clinical” decision-making with their healthcare providers.
“At a time when clarity and trustworthy information are crucial for parents, pediatricians, and the public, this poorly thought-out decision will create more confusion and diminish the confidence in vaccinations,” expressed AAP President Andrew D. Racine in a statement from January. “This approach isn’t constructive for the health of our nation.”





