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Description:This negatively-stained transmission electron microscopic (TEM) image revealed the presence of La Crosse (LAC) encephalitis virus ribonucleoprotein particles (RNP). LAC virus is a member of the Bunyaviridae virus family, California serogroup. This is an arbovorus, which means that transmission occurs through the bite of an infected arthropod, which in this case, is the treehole mosquito, Aedes triseriatus. LAC can also be transmitted through the bite of infected vertebrates including chipmunks and squirrels.
There are approximately 70 cases of La Crosse encephalitis per year, with a case:fatality ratio of <1%. La Crosse encephalitis is usually a mild illness, with fever, headache, nausea, vomiting, and tiredness. People with severe disease, usually children, can have seizures, coma, paralysis, and lasting brain damage. Deaths are rare: the case fatality rate for La Crosse encephalitis is <1 percent.
High Resolution: Click here for hi-resolution image (5.08 MB)
Content Providers(s):CDC/ Dr. J. Obijeski
Creation Date:1976
Photo Credit:
CDC Organization
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Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.