How does vaccine distribution work?

[robby]

Not a great idea. The U.S. military stopped using jet injectors in 1997 due to concerns about blood-borne disease transmission due to splash-back.

We actually discussed them a few weeks ago here:

Coronavirus COVID-19 (2019-nCoV) Thread - 2020 Breaking News

I got a mandatory flu shot while in Navy training using an injector gun. IIRC, the gun used high-pressure compressed air to inject the vaccine directly though the skin. Then I heard a rumor (urban legend?) about some guy who flinched when he was injected, and it cut his arm open. So after that I always requested a vaccine with a needle instead (and my request was honored because by then I was in the fleet and no longer in training). A few years later, they learned there could be cross-contami…