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Smallpox Virus

Photo: Microscopic view of smallpox virus
The smallpox virus, seen in this illustration through the lens of a microscope, killed as many as 30 percent of those it infected. The disease, for which no effective treatment was ever developed, left 65 to 80 percent of survivors marked with deep pitted scars (pockmarks), most prominent on the face. Many survivors were also blinded.
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