Churchill Downs, Farms Take Steps Against West Nile Virus

Churchill Downs' primary weapon against the West Nile virus (WNV) sits in a clear, plastic vial on the desk of track superintendent Butch Lehr, according to AP writer Chris Duncan.

The vial holds birdseed-like pellets that release a chemical that kills mosquitoes in their larval stage. The chemical is otherwise safe and is harmless to horses, making it an ideal mosquito repellent

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