Health officials say mosquitoes collected in Tennessee's largest county have tested positive for the West Nile virus.
The Shelby County Health Department said Tuesday that the virus was found in two south Memphis zip codes. Mosquitoes can transmit West Nile virus to humans through bites.
Crews are treating mosquito breeding sites with insecticides and setting traps to capture and kill the insects.
Standing water found in rain gutters, downspouts, buckets, tires and other receptacles can serve as breeding grounds for mosquitoes.