Health officials issue West Nile warning

May 20, 2010 (CHICAGO)

The virus is transmitted by mosquitoes that get it from infected birds.

The mosquitoes are worst in hot, dry weather. Recent summers have been cool and damp which means fewer cases of West Nile.

Authorities expect to see infected mosquitoes and birds in the next few weeks. People should cover their skin and use mosquito repellent when outside after dusk.

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