The Ebola virus is difficult to diagnose because many of the symptoms can be attributed to other illnesses. To be diagnosed with Ebola, a person must have had contact with someone who has the virus or be exposed to the fluids or remains of a human or animal that carried it. Blood tests can show Ebola, but not until symptoms have been present for at least three days. If a doctor suspects Ebola, the patient will be quarantined to prevent an outbreak.

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