African Hemorrhagic Fever.

Electronmicrograph shows a thin section containing the Ebola virus, the causative agent for African hemorrhagic fever, 1976. The incubation period for Ebola ranges from 2 to 21 days with abrupt onset of illness, characterized by fever, headache, joint and muscle aches, sore throat, and weakness, followed by diarrhea, vomiting, and stomach pain. Image courtesy CDC/Dr. Fred Murphy. (Photo by Smith Collection/Gado/Getty Images).