FWIW, correctly or incorrectly, I just read the OP as saying that people who have already been infected might not need to be vaccinated because they already hav

FWIW, correctly or incorrectly, I just read the OP as saying that people who have already been infected might not need to be vaccinated because they already have been exposed. So that figure might be smaller than what the BBC is floating. Not saying that affects the challenge appreciably, just that I read it differently.