TL;DR
The 2025-2026 flu season ranked among the most severe in years, with CDC preliminary estimates of 31 to 54 million illnesses and up to 780,000 hospitalizations nationwide, driven largely by an H3N2 strain that mutated enough to blunt the vaccine's effectiveness. Vaccination rates fell to their lowest point in years, under 50% coverage. For 2026-2027, all three flu vaccine components have been updated, and a new mRNA flu vaccine option is available for the first time. CDC recommends getting vaccinated in September or October, no later than November.
What actually happened last season
According to reporting from Cedars-Sinai and CHCFL, the 2025-2026 flu season hit hard and early, with at least 19 million Americans infected and roughly 10,000 deaths, including 44 children, by late January alone. CDC's preliminary season-end estimates put the full toll at 31 to 54 million illnesses and 380,000 to 780,000 hospitalizations, with deaths ranging from 23,000 to 78,000 nationally. Influenza A(H3N2) was the dominant strain, and nearly 90% of those H3N2 cases belonged to a subclade carrying mutations that made the season's vaccine a weaker match than usual.
That followed a similarly rough 2024-2025 season, when CDC data cited by MUSC classified the year as "high" severity: 51 million illnesses, 23 million medical visits, 710,000 hospitalizations, 45,000 deaths, and 179 pediatric deaths. Compounding the problem, one physician quoted in the MUSC report noted, "We were under 50% protection last year, and that was the lowest it has been in many years," referring to vaccine uptake.
What's different for 2026-2027
All three components of the flu vaccine have been updated for the coming season, targeting H1N1, H3N2, and the B/Victoria lineage based on the strains public health officials expect to circulate. For the first time, adults 50 and older have access to mFLUSIVA, an mRNA-based flu vaccine from Moderna that the company reports performed roughly 26% better than a traditional vaccine in that age group during trials. FluMist, the nasal spray option, remains available for people who prefer to avoid a needle, though it isn't recommended for higher-risk groups. Adults 65 and older continue to have access to higher-dose or adjuvanted options like Fluzone High-Dose, Flublok, and Fluad.
When to actually get vaccinated
CDC's timing guidance hasn't changed even as the vaccine formulations have: most people should plan to get vaccinated in September or October, and no later than November, so protection is in place before flu activity typically peaks between December and February. Getting vaccinated too early, in August for most adults, can mean immunity starts to wane before the season's peak.
Why surfaces still matter alongside vaccination
Flu spreads primarily through respiratory droplets, but influenza viruses can also survive on hard surfaces, doorknobs, remote controls, kitchen counters, phone screens, for hours, which is part of why household transmission is so common once one person is sick. Vaccination remains the single most effective tool against severe illness, but surface hygiene is a reasonable supplementary layer, particularly in a household where someone is actively symptomatic and other members are trying to avoid catching it.
Where UVCeed fits
254 nm UV-C is effective against a broad range of viruses, including influenza, on hard, non-porous surfaces with adequate contact time and direct line of sight. It doesn't replace vaccination, which addresses the primary airborne and droplet transmission pathway, but it's a useful layer for the shared surfaces a sick household member touches repeatedly.
With UVCeed, you aim the device at one section, a doorknob, a remote control, a phone screen, and hold it steady until the app confirms that section is complete, then move to the next section for larger surfaces like a kitchen counter or bathroom fixture.
FAQ
How bad was the 2025-2026 flu season compared to past years? CDC's preliminary estimates put it at 31 to 54 million illnesses and up to 780,000 hospitalizations, among the more severe seasons in recent memory, driven in part by a mutated H3N2 strain that reduced vaccine effectiveness.
What's new about the 2026-2027 flu vaccine? All three vaccine components were updated to better match expected circulating strains, and adults 50 and older now have access to mFLUSIVA, the first mRNA-based flu vaccine approved in the US.
When should I get my flu shot this year? CDC recommends September or October, no later than November, so protection is active before flu activity typically peaks between December and February.
Does UV-C kill the flu virus on surfaces? 254 nm UV-C is effective against a broad range of viruses including influenza on hard, non-porous surfaces with adequate exposure time and direct line of sight.
Is surface disinfection worth doing if I already got my flu shot? Yes, as a supplementary layer. Vaccination is the primary defense against severe illness, but surface hygiene reduces one additional transmission pathway in a household where someone is already sick.
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