Passengers walk at the hall of San Francisco International Airport on Nov. 10, 2025, in San Francisco.

Experts are warning about the rise of a global “super flu” strain that could hit the Bay Area hard ahead of the holidays.

Newly released data from the California Department of Public Health shows the Bay Area has the highest levels of influenza A in the state, according to wastewater data released Friday. Additionally, flu positivity test rates for the region are now double what they were at the end of November, although they remain relatively low overall.

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In Marin County, about 40 students, or a third of the student body of the Bolinas-Stinson Union School District, were out sick this week thanks to flu-like symptoms, according to a report from the San Francisco Chronicle. (The Chronicle and SFGATE are both owned by Hearst but have separate newsrooms.)

Flu activity in California is........

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