yet different enough not to bring on the smallpox disease once it enters your body. This similar virus is cowpox. The cow to the left has been intentionally infected with cowpox virus. The fluid ...
The last-ever case was diagnosed in 1977. Smallpox is one of only two infectious diseases to have been completely stopped. Hooray for vaccines!
Done again and again, they circled and beat down the disease. Smallpox is caused by variola virus. It is contagious and will spread from person to person. A fever gives way to a rash, that turns ...
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