California is grappling with an unusually severe flu season this winter, with hospitalizations rising and concerns that the outbreak could last for weeks.
The situation is particularly dire in the Bay Area, where Dr. Peter Chin-Hong, an infectious disease expert at UCSF, said flu activity has reached alarming levels. He called 2025 “the year of flu in the Bay Area” and highlighted the overwhelming number of cases impacting emergency departments.
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He noted that at local clinics, more than 70% of respiratory virus tests are testing positive for influenza, outpacing the combined totals of RSV, COVID-19 and the common cold.
“We have been getting messages all day that our hospital is full to the brim,” Chin-Hong said. “Influenza seems to be everywhere.”
According to the California Department of Public Health, the flu test positivity rate surged to 27.8% as of Feb. 1, while the rate for RSV fell to 5% and COVID-19 held at 2.4%.
No bird flu viruses were detected in humans in the latest report, even though there have been 68 confirmed human cases nationwide, including 38 in California, most linked to exposure to infected poultry or cattle.
With increasing flu hospitalizations, particularly with vulnerable populations such as the elderly and young children, health experts are urging action.
“Get the flu vaccine if you haven’t gotten it yet — there is still time,” Chin-Hong said.
Flu season typically lasts until May, but it takes a couple of weeks for the vaccine to take full effect. Getting vaccinated can reduce the risk of hospitalization and make symptoms less severe. The vaccine protects against three flu strains, including H1N1 and H3N2, known for causing more severe illness.
“Although COVID tends to disproportionately affect the very old, flu can cause children to get very ill and even die,” Chin-Hong said.
California has already reported at least 10 pediatric flu deaths this season, including three in San Diego County.
“These recent flu deaths among our youth are tragic and concerning as we head into what historically is the peak of flu season,” Dr. Ankita Kadakia, San Diego County’s interim public health officer, said in a statement.




















