West Nile virus (WNV) is a mosquito borne disease that can cause serious illness, sometimes fatal, in people and horses. WNV is seasonally epidemic in North America and becomes a health concern during the summer months. WNV is transmitted in the southern US by the Southern house mosquito, Culex quinquefasciatus, which acquires the disease pathogen by feeding on birds. The Southern house mosquitoes is an evening/night feeder and is found to live in close proximity with humans, making it easy for the mosquito to transmit WNV to humans.