how did they eradicate smallpox?
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The US, with the advice of top scientist D.A. Henderson, decided to eradicate what little smallpox they had as an attempt to eliminate once and for all the terrible life-taking potential of the disease. However it became clear that not all smallpox had been eradicated (the Soviet Union stockpiled the virus). Henderson's movement was paradoxical in that eradicating the virus had just made the world more vulnerable to its terrible power by eliminating the potential for immunization.
There was a huge global effort to eradicate the disease and a final agreement was reached to only hold the remaining bacteria in only 2 laboratories in the USA and Russia
In the USA, Henderson helped lead the US effort to eradicate smallpox
Everyone was either inoculated/vaccinated (uninfected) or isolated (infected) until the virus eventually died out