West Nile fever


West Nile fever
a viral disease caused by the West Nile virus (a flavivirus), which is spread by the Culex pipiens mosquito. It causes encephalitis, with influenza-like symptoms, enlarged lymph nodes, and a bright red rash on the chest and abdomen. In patients with a weakened immune system (such as the elderly) it can progress to convulsions, coma, and paralysis.

Medical dictionary. 2011.