FOH!
I'm assuming they have to get nano-doses since microdoses are too much for them. The fuckery is unreal at this point.
You literally have a virus that will become the 9th common cold virus in a matter of months which the previous 8 don't require shots.
WTF happen to the 22-25,000 influenza deaths?
You can make this shit up in a SciFi movie.