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Diagnosis of ebola Download Audio

Diagnosing Ebola Virus Disease (EVD) shortly after infection can be difficult. Early symptoms of EVD such as fever, headache, and weakness are not specific to Ebola virus infection and often are seen in patients with other more common diseases, like malaria and typhoid fever.
To determine whether Ebola virus infection is a possible diagnosis, there must be a combination of symptoms suggestive of EVD AND a possible exposure to EVD within 21 days before the onset of symptoms. An exposure may include contact with:
  • blood or body fluids from a person sick with or who died from EVD
  • objects contaminated with blood or body fluids of a person sick with or who died from EVD
  • infected fruit bats and primates (apes or monkeys)
  • semen from a man who has recovered from EVD
If a person shows early signs of EVD and has had a possible exposure, he or she should be isolated (separated from other people) and public health authorities notified. Blood samples from the patient should be collected and tested to confirm infection. Ebola virus can be detected in blood after onset of symptoms, most notably fever. It may take up to three days after symptoms start for the virus to reach detectable levels. A positive laboratory test means that Ebola infection is confirmed. Public health authorities will conduct a public health investigation, including tracing of all possibly exposed contacts.

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