CHRIS BJORNBERG / SCIENCE PHOTO LIBRARY CHRIS BJORNBERG / SCIENCE PHOTO LIBRARY
Smallpox virus (Poxviridae). The virus is characterized by a skin rash and a high death rate. Some symptoms of smallpox are high fever, fatigue, severe headache, backache, malaise, rash, delirium, vomiting, diarrhea, and excessive bleeding. Magnification: 40,000x.
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