Health officials are concerned about West Nile virus. Mosquitoes in Joliet and Chicago tested positive. The Illinois ...

West Nile virus cases are rising across the United States. Public health officials are reporting more infections than usual. The virus spreads through mosquito bites. Most people do not show symptoms.

These bloodsuckers benefit from warmer and wetter conditions. Health officials issue warning after batch of mosquitoes test positive for potentially fatal virus: 'Start taking precautions' first ...