Culex quinquefasciatus, commonly known as the southern house mosquito, is a medium-sized brown mosquito that exists throughout the tropics and the lower latitudes of temperate regions. This species is found in the southern United States and is present throughout Florida and the Florida Keys. This nighttime-active, opportunistic blood feeder is a vector of many of pathogens, several of which affect humans. Throughout much of the southern U.S., Cx. quinquefasciatus is the primary vector of St. Louis encephalitis virus (SLEv). Culex quinquefasciatus also transmits West Nile virus.