Quote:
Originally Posted by pdurrant
The problem is that herd immunity requires mass vaccination. Any particular person, even if vaccinated, might still catch and pass on the disease. Allowing even vaccinated Americans into an unvaccinated Canadian population would be madness.
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Yep, because even if vaccinated, not all vaccinated develop the necessary antibodies. I had to have german measles vac titered and repeated several times because of that. Paul, I can't believe I'm older than you!
