Symptoms of Ebola usually appear between 2 and 21 days after exposure and often begin suddenly with fever, fatigue, headache, muscle pain, and sore throat. As the disease progresses, patients may develop vomiting, diarrhea, stomach pain, rash, and impaired liver and kidney function. In severe cases Ebola can cause internal and external bleeding, including bleeding from the gums, nose, or gastrointestinal tract. Because early symptoms resemble those of illnesses such as malaria or influenza, Ebola can be difficult to identify in the initial stages of an outbreak.
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