It wasn't the vaccines that helped. It was clean water and
Posted on: August 22, 2019 at 11:21:49 CT
sjbe4d MU
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plumbing. Thank your plumber not your doctor.
Besides that...Herd immunity is the idea that epidemiologists found that when 68% of a population had had a communicable disease and gotten over it, then the disease was no longer seen in the community...even in people who hadn't had it. 68%....