“we’re due to take my crazy MIL , age 91, for her second shot....are we in danger?....how does this vaccine effect get transmitted?...air?”
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It radiates from the vaccinated to the unvaccinated. You’ll need to keep at least 2 inches of lead shielding between your MIL and yourself.
Alternatively, you could simply recognize the truth that the anti-vaxxers are simply trying to frighten people with insane conspiracy promotions.
The real question is can you inoculate your girlfriend if you are vaccinated and have sex?