La Crosse Encephalitis
| La Crosse encephalitis | |
|---|---|
| Classification and external resources | |
| Specialty | infectious disease |
| ICD-10 | A83.5 |
| ICD-9-CM | 062.5 |
| La Crosse Virus | |
|---|---|
| Virus classification | |
| Group: | Group V ((−)ssRNA) |
| Family: | Bunyaviridae |
| Genus: | Orthobunyavirus |
| Species: | La Crosse Virus |
La Crosse encephalitis is an encephalitis caused by an arbovirus (the La Crosse virus) which has a mosquito vector (Ochlerotatus triseriatus synonym Aedes triseriatus).
La Crosse encephalitis virus (LACV) is one of a group of mosquito-transmitted viruses that can cause encephalitis, or inflammation of the brain. LAC encephalitis is rare; in the United States, about 80–100 LACV disease cases are reported each year, although it is believed to be under-reported due to minimal symptoms experienced by many of those affected.
It takes 5 to 15 days after the bite of an infected mosquito to develop symptoms of LACV disease. Symptoms include nausea, headache, vomiting in milder cases and seizures, coma, paralysis and permanent brain damage in severe cases.
LAC encephalitis initially presents as a nonspecific summertime illness with fever, headache, nausea, vomiting and lethargy. Severe disease occurs most commonly in children under the age of 16 and is characterized by seizures, coma, paralysis, and a variety of neurological sequelae after recovery. Death from LAC encephalitis occurs in less than 1% of clinical cases. In many clinical settings, pediatric cases presenting with CNS involvement are routinely screened for herpes or enteroviral causes. Since there is no specific treatment for LAC encephalitis, physicians often do not request the tests required to specifically identify LAC virus, and the cases are reported as aseptic meningitis or viral encephalitis of unknown cause.
As with many infections, the very young, the very old and the immunocompromised are at a higher risk of developing severe symptoms.
The La Crosse encephalitis virus is a type of arbovirus called a bunyavirus. The Bunyaviridae are one of several families of arboviruses.
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