smallpox
Smallpox is a severe infectious disease caused by smallpox virus, which is highly contagious and has a high mortality rate. The clinical manifestations are extensive rashes appearing in batches, which develop into spotted rash, pimples, herpes, and pustules in sequence, with severe viremia; after the scabs and scabs of pustules, pitting scars remain for life. Smallpox is by far the first infectious disease to be eliminated by humans worldwide.
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