St. Louis County steps up effort against West Nile virus

Thursday, August 30, 2012 | 6:53 a.m. CDT; updated 10:03 a.m. CDT, Thursday, August 30, 2012

CLAYTON — West Nile virus cases are on the rise in many parts of the country, and while no human cases have been reported in St. Louis County, health officials aren't taking any chances.