Originally posted by AFPheonix
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If a large enough percentage of the 'herd' isn't immune, the herd immunity fails. I forget what the exact percentage is - and it's in one of my books that's currently in a plastic box in the shed - but it's a scarily small percentage. Less than ten percent, I think.
If ten percent of parents don't get their kids immunised, and the kids don't take care of it as adults, we could get smallpox back. And polio. Whooping couch. Yellow Fever. And so on.
To quote Dr House: "I'm cursed with the ability to do the math."
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