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West Nile virus

noun, Pathology.
1.
an illness caused by a chiefly mosquito-borne virus of the genus Flavivirus, characterized in a small percentage of infected persons by fever, headache, muscle weakness, and sometimes encephalitis or meningitis.
2.
the virus that causes this illness.
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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Contemporary definitions for West Nile virus
noun

the modern culture of Europe and North America; also, the study of this culture

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West Nile virus in Medicine

West Nile virus (wěst nīl)
n.
A viral disease of varying severity, occurring in Africa, Asia, the Mediterranean, and parts of North America, that is transmitted by a culex mosquito.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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West Nile virus in Science
West Nile virus
  (wěst nīl)   
An infectious disease caused by a virus of the genus Flavivirus, occurring in Africa, Asia, the Mediterranean, and parts of North America. The infection is transmitted by a mosquito and can cause mild illness as well as severe, sometimes fatal encephalitis and meningitis.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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