West Nile Virus
Last reported: July 2025
3 active species · Season May–Oct · Desert/Arid climate · Very Low standing-water risk
Last reported: July 2025
Culex tarsalis
Medium brown mosquito found primarily in western US. Important vector for encephalitis viruses. Breeds in clear water.…
Carries: West Nile Virus · Western Equine Encephalitis (WEE) · St. Louis Encephalitis
Culex pipiens
Brown mosquito with banded legs. Common in temperate climates. Often enters homes at night. Prefers standing water with organic matter.…
Carries: West Nile Virus · St. Louis Encephalitis · Avian Malaria
Aedes albopictus
Striking black mosquito with white stripes on legs and thorax. Originally from Southeast Asia, now widespread in North America. Known for aggressive, persistent biting behavior.…
Carries: Dengue Fever · Zika Virus · West Nile Virus