Respiratory Virus Update: Oct. 9, 2026 Posted on October 9, 2026 Respiratory virus season is starting in San Mateo County, with early influenza activity already increasing. COVID-19 activity remains elevated but is decreasing, while RSV activity is currently low. Now is a good time to get vaccinated. It takes about two weeks for protection to develop after vaccination. Updated 2026-27 influenza and COVID-19 vaccines are available and can be given at the same time. Where to Get Vaccinated To find a vaccine near you: Talk to your doctor. Visit MyTurn. Check with local pharmacies. Current Respiratory Virus Activity As of Oct. 3, 2026, respiratory virus activity in San Mateo County shows: Influenza: Activity is increasing. COVID-19: Activity remains elevated but is decreasing. RSV: Activity is low but is expected to increase in the coming weeks. Respiratory illness activity is currently high in the Bay Area. When respiratory viruses are circulating at high levels, it is important to take steps to stay healthy and protect those around you. Weekly Respiratory Virus Dashboard The San Mateo County Health Office of the Health Officer maintains a Respiratory Virus Dashboard, updated every Friday, with information on COVID-19, influenza and RSV activity. Latest data: Week ending Oct. 3, 2026 Updated: Oct. 9, 2026 The following snapshots show the latest available data. Select an image to view it at full size. COVID-19 Influenza (Flu) Respiratory Syncytial Virus (RSV) View the latest Respiratory Virus Dashboard