Quarantine and vaccination. One without the other wouldn't have worked. http://www.lib.umich.edu/online-exhibits/exhibits/show/smallpox-eradication-india … https://twitter.com/drphyto/status/718959352212656128 …
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@BeckyJohnson222@GeoffSchuler@drphyto And I suppose you can prove that polio is not caused by a virus?
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