RICHMOND, Va. (WWBT)—The Richmond and Henrico Health Districts (RHHD) are warning Henrico County residents about an increased risk of contracting the West Nile Virus.

According to Henrico County’s Department of Public Works’ Vector Surveillance and Control Division , at least 50 percent of mosquito trap sites tested in the past two weeks have returned positive results for West Nile Virus.

There have been no recent documented human cases of WNV in Henrico County.

Mosquito trap sites collect a pool of mosquitoes from a specific area; if one mosquito in a trap tests positive, regardless of how many mosquitoes are in the trap, the trap site is considered positive. RHHD and Henrico County consider 50 percent or more of mosquito trap sites testing positive for WNV for two consecutive week

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