variants
or St. Louis encephalitis
: a North American encephalitis that is caused by a flavivirus (Orthoflavivirus louisense) transmitted by several culex mosquitoes
Examples of Saint Louis encephalitis in a Sentence
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The southern house mosquito (Culex quinquefasciatus), a carrier of West Nile and Saint Louis encephalitis viruses, can also transmit Oropouche, though not very efficiently, and its range throughout the tropics raises the possibility of Oropouche outbreaks in Africa, southeast Asia, and Australia.
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Daniel Grossman, Science | AAAS, 29 Apr. 2021
On September 22, the CDC researchers were stunned to find that the birds were not killed by Saint Louis encephalitis.
—Carl Zimmer, Discover Magazine, 17 Aug. 2012
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Daniel Grossman, Science | AAAS, 29 Apr. 2021
On September 22, the CDC researchers were stunned to find that the birds were not killed by Saint Louis encephalitis.
—Carl Zimmer, Discover Magazine, 17 Aug. 2012
Cite this Entry
“Saint Louis encephalitis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Saint%20Louis%20encephalitis. Accessed 12 Nov. 2025.
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Saint Louis encephalitis
noun
Saint Lou·is encephalitis
-ˌlü-əs- 
: a North American encephalitis that is caused by a flavivirus (Orthoflavivirus louisense) transmitted by several mosquitoes of the genus Culex compare japanese encephalitis
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