Smallpox virus

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2689   3 years ago
samer176 | 2 subscribers
2689   3 years ago
Smallpox disease is a serious, highly contagious, and often life-threatening infection marked by a rash of round pox (blisters) on the face, arms, and legs. It is caused by the Variola virus. The last case of smallpox in the United States was in 1949.
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