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Clinical Review Quiz

  West Nile Encephalitis: Review Questions

Sajan Thomas, MD and Hema Azad, MD

Dr. Azad is a resident in internal medicine and Dr. Thomas is assistant program director of the internal medicine residency program, Westlake Hospital, Melrose Park, IL.

The questions below are based on the May 2004 cover article, “West Nile Encephalitis”

Choose the single best answer for each question.


1. What is the incubation period of West Nile virus infection in human beings?
  1. 6-24 hours
  2. 1-2 days
  3. 2-14 days
  4. 2-4 weeks
  5. 4-8 weeks
Click here to compare your answer.

2. What percentage of West Nile virus-infected persons develop severe illness with central nervous system involvement?

  1. 0.33%
  2. 0.67%
  3. 1.3%
  4. 3.1%
  5. 5.1%
Click here to compare your answer.

3. Which of the following clinical features is uncommon in West Nile encephalitis?
  1. Altered mental status
  2. Fever
  3. Headache
  4. Nuchal rigidity
  5. Optic neuritis
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4. All of the following clues raise the index of suspicion for a diagnosis of West Nile encephalitis EXCEPT:
  1. Mosquito season
  2. Unexplained bird death in the region
  3. Age less than 50 years
  4. Hyporeflexia
  5. Muscle weakness and/or flaccid paralysis
Click here to compare your answer.


5. In patients with West Nile encephalitis, what percent of patients have leptomeningeal or periventricular enhancement on magnetic resonance imaging?
  1. 10%
  2. 30%
  3. 50%
  4. 70%
  5. 90%
Click here to compare your answer.


6. What is the best option available currently for the treatment of West Nile virus infection?
  1. Corticosteroids
  2. Interferon alfa-2b
  3. Osmotic agents
  4. Ribavirin
  5. Supportive management
Click here to compare your answer.




Click here to read more about West Nile Encephalitis
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Updated 1/04/08 • kkj