La Crosse encephalitis (USA – Indiana)

12 October 2017 – A 6 year old boy and a 11 year old girl from Batesville, Indiana are struggling to recover from infections with La Crosse virus. La Crosse virus (LACV) is a member of the California serogroup of arboviruses. A map of the distribution of California virus serogroup neuroinvasive disease cases (mainly LACV cases) shows 3 major focal geographic areas: (1) in the unglaciated areas of southeastern Minnesota/southwestern Wisconsin/northwestern Illinois, (2) Ohio, and (3) the central Appalachian Mountain areas of Virginia/West Virginia and North Carolina/Tennessee (see the CDC map). Primary vectors are Aedes triseriatus, the tree hole mosquito, but invasive Ae. albopictus and, notably, Ae. j. japonicus seem to have enhanced transmission.

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