1 exists 1doesn't: Chickenpox is a human only viral infection that is often experienced in childhood.A vaccine is available to prevent it.Chickenpox is relatively low risk with 1death/80, 000 cases.Smallpox was a human only viral infection that last caused disease in the wild in 1978.It was high risk, 30% of cases were fatal. The world health organization declared smallpox extinct.
Answered 10/28/2012
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