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Ebola is a rare and deadly disease caused by infection with a virus of the family Filoviridae, genus Ebolavirus. Ebola can cause disease in humans and other primates (monkeys, gorillas, and chimpanzees).

Ebola was first discovered in 1976 near the Ebola River in what is now the Democratic Republic of the Congo. Since then, outbreaks have appeared sporadically in several African countries.

The 2014-2015 Ebola epidemic was the largest in history, affecting multiple countries in West Africa. Although the risk of an Ebola outbreak in the United States is very low, the Centers for Disease Control and Prevention (CDC) have taken precautions to prevent an outbreak from happening. Healthcare professionals caring for Ebola patients and those in close contact with Ebola patients are at highest risk of getting sick, as they may come into contact with the blood or body fluids of sick patients. The virus is spread to humans when there is direct contact (through broken skin; areas of the skin that have been opened by cuts, abrasions, dermatitis, chapped skin; or mucous membranes) with:

  • blood or body fluids
  • objects that have been contaminated with the virus (e.g., needles)
  • infected animals


It can take anywhere from two to 21 days after infection for symptoms to appear, but the average length of time is 8-10 days. Symptoms include fever (greater than 101.5°F), severe headache, muscle pain, weakness, diarrhea, vomiting, stomach pain, and unexplained bleeding or bruising.