The 2025–2026 flu season is running severe, per CDC data published January 16, 2026: the agency's FluView report for the week ending January 10 recorded 15 influenza-associated pediatric deaths in a single week, 32 for the season so far, and estimated at least 18 million illnesses, 230,000 hospitalizations, and 9,300 deaths nationwide since October. For New Yorkers weighing whether this winter's cough is worth a sick day, the federal numbers suggest the answer is usually yes.
This site publishes information, not medical advice — decisions about vaccination, testing, and treatment belong with a clinician who knows your history.
How bad is this flu season compared with other years?
The raw counts put the season among the heavier ones in recent memory. Per CDC, 17,579 laboratory-confirmed flu hospitalizations were logged between October 1, 2025 and January 10, 2026, and outpatient visits for influenza-like illness reached 5.3% nationally — well above the seasonal baseline. The sharpest signal, though, is pediatric: fifteen children died of influenza in one week, a toll the agency's own surveillance describes as unusually concentrated.
Which strain is driving the wave?
Influenza A(H3N2) is the dominant virus this season, per the CDC's virologic surveillance, and roughly 90.9% of the characterized H3N2 specimens belong to subclade K — the variant that circulated prominently in other countries before reaching the United States. Clinical laboratories found flu in 18.6% of respiratory specimens tested that week, indicating widespread transmission rather than a regional spike. H3N2 seasons have historically been harder on older adults, which is why the hospitalization curve is watched as closely as the case count.
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Does the flu shot still help against subclade K?
Vaccination remains the CDC's standing recommendation even mid-season, and the agency continues to advise anyone without a contraindication to get a flu vaccine while viruses circulate. What the current data cannot yet say is precisely how well this year's formulation matches subclade K in the United States — vaccine effectiveness estimates arrive later in the season, after enough vaccinated and unvaccinated cases accumulate to compare. The earlier match data from countries that saw subclade K first was mixed, which is exactly why the CDC pairs vaccination advice with a second tool: antiviral treatment, ideally started within 48 hours of symptoms, for people at higher risk of complications.
What should New Yorkers do with these numbers?
Treat them as a timing signal rather than a scare. A severe H3N2 wave in mid-January means crowded subways and offices are efficient delivery systems for the virus, and that a same-week vaccination or a prompt antiviral prescription still has weeks of season left to work against. The practical checklist per CDC guidance is short: get vaccinated if you have not, stay home while feverish, and call a clinician early if you are 65 or older, pregnant, or managing asthma, diabetes, or heart disease. The FluView report updates every Friday, and this season's Friday readings have been worth checking.