Overview
- WastewaterSCAN and local wastewater programs report high or spiking rotavirus traces in multiple California municipalities, including San Francisco, San Jose, Fremont, Santa Cruz, Gilroy, Marina, Ontario and parts of Los Angeles County.
- Experts characterize the pattern as a common late‑spring surge that appears to be peaking or subsiding across many Bay Area communities while Monterey shows signs of active local transmission.
- Rotavirus causes severe watery diarrhea and vomiting in infants and young children, can spread for days after recovery, has no specific antiviral treatment and historically accounts for tens of thousands of pediatric hospitalizations each year.
- The California Department of Public Health advises completing the rotavirus vaccine series by eight months, and clinicians stress vigorous handwashing with soap and water because hand sanitizer is less effective at stopping this fecal‑oral virus.
- Wastewater monitoring gives early signals of community spread but cannot count cases directly, so parents and childcare sites should watch for symptoms, seek prompt rehydration and medical care when needed, and expect the seasonal wave to wane rather than expand into a major summer surge.