Read the response I wrote out to len.george yesterday at the top of these comments.
Thank-you.
p.s. Only 10% of the world was ever vaccinated for smallpox, and they no longer vaccinate for smallpox except sometimes in the military and yet smallpox hasn't come back after all these many years. And deaths from Scarlet Fever hasn't come back either, even though there NEVER WAS a vaccine developed for it.
Canadian-coconut, mmm. With improved understanding of the transmission of smallpox the primary use of the smallpox vaccine was localised in support of outbreak quarantine, in effect a second fence. Supplies of the vaccines are still maintained against the possibility of further outbreaks. And whatever gave you the idea that scarlet fever is no longer a problem? It is still very much with us, although it is easily treated with anti-biotics. Like MDR TB and MRSA that may not, and most likely will not, always be the case.
Canadian-coconut, mmm. With improved understanding of the transmission of smallpox the primary use of the smallpox vaccine was localised in support of outbreak quarantine, in effect a second fence. Supplies of the vaccines are still maintained against the possibility of further outbreaks. And whatever gave you the idea that scarlet fever is no longer a problem? It is still very much with us, although it is easily treated with anti-biotics. Like MDR TB and MRSA that may not, and most likely will not, always be the case.
If you read my comment carefully, I said that "DEATHS" from scarlet fever haven't come back.
Evolution, like comprehension, is a wonderful thing.