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It's important to note they're using an active form of a flu vaccine for this experiment. I was originally wondering how they can do this with an inactive vaccine (which all flu vaccine used on humans are(?)). Nevertheless, this sounds really awesome!

For influenza, humans may receive either inactived vaccines (e.g. common shot) or live attenuated vaccines (e.g. nasal spray).[1]

I assume whether a live virus is attenuated in research like TFA depends on the hypothesis they're testing. ?

[1] https://www.cdc.gov/flu/prevent/how-fluvaccine-made.htm

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