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Medical Health Encyclopedia
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Mosquito, adult feeding on the skin
Mosquito, adult feeding on the skin
Mosquito, adult
Mosquito, adult
Mosquito, egg raft
Mosquito, egg raft
Mosquito, pupa
Mosquito, pupa
Meninges of the brain
Meninges of the brain


West Nile virus

Symptoms:

Mild disease, generally called West Nile fever, has some or all of the following symptoms:

  • Fever
  • Headache
  • Back pain
  • Muscle aches
  • Lack of appetite
  • Sore throat
  • Nausea
  • Vomiting
  • Abdominal pain
  • Diarrhea

These symptoms usually last for 3 to 6 days.

Text Continues Below



With more severe disease, the following symptoms can also be seen and require prompt attention:



Signs and tests:

Signs of West Nile virus infection are similar to those of other viral infections. There is nothing that can be found on physical examination to diagnose West Nile virus infection.

A rash is present in 20-50% of patients. True muscle weakness in the presence of other related symptoms is suggestive of West Nile virus infection.

Diagnostic tests that may be used if West Nile virus is suspected include the following:

The most accurate way to diagnose this infection is serology, a test to detect the presence of antibodies against West Nile virus in CSF or serum (a blood component). This is considered the gold standard for diagnosis.

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