La Crosse Virus

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The page below is a sample from the LabCE course Mosquito-Borne Viral Diseases. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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La Crosse Virus

The virus that causes La Crosse (LAC) encephalitis is a single-stranded enveloped RNA virus in the Bunyaviridae family. It is transmitted by the mosquito, Aedes triseriatus (the Eastern tree hole mosquito). This mosquito is an aggressive daytime biter.
The lifecycle occurs near deciduous forests between the mosquito and small mammals, such as squirrels and chipmunks.
Figure 30. Transmission of La Crosse virus. (2024). Centers for Disease Control and Prevention. https://www.cdc.gov/la-crosse-encephalitis/php/transmission/index.html
Figure 31. Public health domain. (1976). Image#10240. This negative-stained transmission electron microscopic (TEM) image revealed the presence of La Crosse (LAC) encephalitis virus ribonucleoprotein particles (RNP). Centers for Disease Control and Prevention. https://phil.cdc.gov/Details.aspx?pid=10240

Figure 30. La Crosse virus transmission cycle
Figure 31. La Cross virus particles