Flu cases surging in California as officials warn of powerful strain

"California officials are issuing warnings about a new flu strain that is increasing flu-related cases and hospitalizations statewide, with public health experts across the nation echoing the alerts. A newly emerged influenza A strain, H3N2 subclade K, is already wreaking havoc globally and is affecting hospitals and clinics in California, the California Department of Public Health announced on Tuesday. Although the agency did not provide specific data for California cases, it described the seasonal flu activity as "elevated" in the state."

"In Los Angeles County, recent data from the health department shows that between the end of last year and start of 2026, there were 162 flu-related hospitalizations and an additional 18 cases where patients were admitted into intensive care. So far, this flu season has led to the highest number of cases in in the U.S. in more than 30 years."

A newly emerged influenza A strain, H3N2 subclade K, is driving elevated seasonal flu activity in California and affecting hospitals and clinics. Flu rates began rising in mid-December and remain elevated, with data delays from recent holidays and expectations of a plateau in the coming weeks. Most flu cases are managed without hospitalization; older adults and people at higher risk account for most admissions. CDPH reports high positivity in Central California and the Bay Area, moderate rates around Sacramento and Southern California, and low rates in rural northern counties. CDC estimates indicate millions of infections, with substantial hospitalizations and deaths since late fall.

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