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The First mRNA Flu Shot Just Got FDA Approval — And It Almost Didn't

The FDA just approved the first-ever mRNA flu vaccine — and it almost got rejected before it began. Here's how mFLUSIVA cleared the bar, and why its approval unlocks Moderna's entire next wave of mRNA vaccines.

The First mRNA Flu Shot Just Got FDA Approval — And It Almost Didn't

By Siddharth Jangid

10 August 2026·3 min read

Six months ago, the FDA wouldn't even look at this vaccine. This week, it approved it.

The Approval

The FDA cleared mFLUSIVA on August 5, 2026 – Moderna’s mRNA-based seasonal flu vaccine – for adults 50 and older. It’s the first influenza vaccine in U.S. history built on the same messenger RNA platform that powered the COVID-19 vaccines. Moderna expects it in select retailers within weeks, in time for the 2026–27 flu season, making it the company’s fourth FDA-licensed product after Spikevax, mNEXSPIKE, and mRESVIA.

The approval actually came in two tiers. Adults 50 to 64 got standard, full approval. Adults 65 and older got accelerated approval — a pathway that allows licensing based on a surrogate endpoint reasonably likely to predict clinical benefit, with a required follow-up confirmatory trial.

The Numbers

The approval now hinges on FLUENT, a Phase 3 trial that put mFLUSIVA through the wringer with 40,000+ adults aged 50+ across 301 sites in 11 countries during the 2024-25 flu season.

Compared head-to-head with a standard-dose flu vaccine, mFLUSIVA delivered ~27% better relative vaccine effectiveness.

And the side effects? Pretty standard flu-shot territory: sore arm, fatigue, and headache. Nothing wildly unexpected.

The technical edge matters too. Most flu vaccines are still made using chicken eggs, a process that’s slow and means guessing months ahead which flu strains will take over the season.

mRNA vaccines basically skip that whole step. They can be made faster and tweaked closer to flu season – a pretty big deal when flu strain predictions don’t always hit the mark.

The Backstory Nobody's Vaccine Announcement Usually Has

This one has a real subplot. Back in February, Vinay Prasad,then the FDA's head of biologics, overruled the agency’s career staff and issued a “refusal-to-file” notice, meaning the FDA initially decided Moderna’s application wasn’t ready to be formally reviewed based on the data submitted.

Just two weeks later, after Moderna publicly pushed back, the FDA reversed that decision and agreed to review the application. An independent advisory panel met in June and unanimously recommended approval.

The move also comes against the broader backdrop of skepticism toward mRNA vaccines from HHS Secretary Robert F. Kennedy Jr., who last year cancelled 22 federally funded mRNA vaccine development projects. So even with the approval now final, it’s likely to face criticism from Kennedy’s allies and other mRNA skeptics.

Why It's Bigger Than One Vaccine

This approval does more than just put another product on pharmacy shelves. It also clears a regulatory roadblock for two other stalled Moderna programs: a combination COVID-and-flu Shot (mRNA-1083) that can now move toward U.S. resubmission, and a H5 pandemic flu vaccine program with CEPI, whose Phase 3 data requirements were contractually tied to this exact approval.

Basically, mFlusiva wasn’t just fighting for shelf space against traditional flu shots. It was the keystone holding up a big chunk of Moderna’s broader mRNA pipeline – and for months, that entire pipeline was stuck waiting for Moderna to convince a skeptical FDA to simply take a look.

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