Flu vaccines just got a real upgrade, and there are still solid antiviral treatments for anyone who gets sick anyway. Here's what's actually available on both sides, how this year's flu season went, and a couple of other things worth knowing.
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There's a whole new type of flu vaccine now
On August 5, 2026, the FDA approved mFLUSIVA, a flu vaccine from Moderna made using mRNA technology. It is the same kind used in COVID-19 vaccines. Every flu vaccine before this one was made a different way. Right now it's approved for adults 50 and older. In the study behind the approval, people who got it were 27% less likely to come down with flu-like illness than people who got a regular flu shot.
What you can actually take if you get the flu
There are four FDA-approved flu medications, and they all work best if you start them within 48 hours of getting sick:
Oseltamivir is the one doctors prescribe most often, a pill you take twice a day for five days. Baloxavir marboxil is different: it's just one dose. As of June 2026, there's finally a generic version of it too, so more people can get this single-dose option. Zanamivir is inhaled, and it's meant for people aged 7 and older. And peramivir is a one-time IV drip, usually kept for people who can't take a pill or use an inhaler.
How this flu season actually went
This past flu season (2025–2026), the vaccine didn't protect as well as usual, only about 33% effective against any strain of flu. The main reason is that the flu virus going around had shifted enough that it no longer matched the vaccine very well. Protection still varied by age group, and interestingly, kids who got the nasal spray version were better protected than kids who got the regular shot (55% versus 39%).
Scientists are trying to build a flu vaccine that lasts more than one season
Right now, flu vaccines target the part of the virus that changes the most every year, which is exactly why you need a new one annually, and why mismatches like this season happen. A "universal" vaccine would instead target the parts of the virus that barely change at all, so it could theoretically work season after season without being redesigned.
One candidate, tested in an April 2026 study, triggered a much stronger immune response than a regular flu shot. It even protected mice from a deadly dose of bird flu, even though it wasn't built for that specifically. It's still early days, it's only been tried in small human trials so far, but it's a hint of where flu vaccines might be headed.
How to find a flu study
You can search flu vaccine and treatment studies on our platform, filter by location, and see whether you meet the basic criteria before applying. Right now, there are studies recruiting across a range of angles. For example, a pediatric surveillance study is tracking how well baloxavir marboxil works in children with the flu, and a separate study is comparing high-dose versus standard-dose flu vaccine in pediatric solid organ transplant recipients. The process usually takes a few minutes, and a coordinator follows up afterward to walk you through next steps.
Common questions
What is flu (Influenza)? Influenza is a contagious respiratory illness caused by a virus that spreads easily from person to person, especially during flu season. It usually causes fever, cough, sore throat, and fatigue, and while most people recover within a week or two, it can be more serious for young children, older adults, and people with certain health conditions.
How many people die from the flu each year? In the US, flu-related deaths range widely, anywhere from about 4,900 to 51,000 in a given year. That huge swing isn't random. It comes down to which flu strains are circulating that season and how well that year's vaccine matches them. It's part of why flu shouldn't be written off as "just a bad cold," even though most people do recover within a week or two.
Is the flu the same as a cold? No, even though symptoms overlap. Influenza tends to come on faster and hit harder, higher fever, more intense body aches and fatigue, while colds are usually milder and develop more gradually. The distinction matters because antiviral treatments are specific to flu and don't help with a cold.
Can you still get the flu after getting vaccinated? Yes. No flu vaccine is 100% effective, partly because the circulating strains can drift from what the vaccine targets, as happened this season. Vaccination still meaningfully lowers the odds of getting sick and tends to reduce severity if you do.