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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.
How soon after exposure do symptoms appear?

It takes from 5 to 15 days after the bite of an infected mosquito to develop symptoms of LaCrosse encephalitis.

How is LaCrosse encephalitis diagnosed?

Diagnosis is based on tests of blood or spinal fluid.

Who is at risk for LaCrosse encephalitis?

Anyone can get LaCrosse encephalitis, but some people are at increased risk:

• Children under 16 years of age;

• People who live in or visit woodland habitats in areas where the disease is common;

• People who work outside or participate in outdoorrecreational activities in areas where the disease is common.

High Resolution: Click here for hi-resolution image (4.85 MB)
Content Providers(s):CDC/ Dr. J. Obijeski
Creation Date:1976
Photo Credit:
Links:CDC – Nat. Center for Infectious Diseases; Div. of Vector-Borne Diseases; Fact Sheet: La Crosse Encephalitis
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.