This 70-year-old woman, who lives in a rural area in the Midwestern United States, developed an illness in August that progressed over 3 days to include a moderate fever, headache, lower extremity weakness, and lethargy progressing to severe confusion.
On examination, she is unresponsive to verbal stimuli, and both pupils respond sluggishly to light. No other neurologic abnormalities are apparent. She lives with her husband on an old farm, and rodents have been frequently seen around the house and barn.
Question 1 of 3
Which one of the following would be the most probable viral cause?
A - Western equine encephalitis
B - California (La Crosse strain) encephalitis virus
C - Colorado tick fever virus
D - West Nile virus
E - Lymphocytic choriomeningitis virus
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