Which genus is the primary mosquito vector for West Nile Virus in many regions?

Which genus is the primary mosquito vector for West Nile Virus in many regions?

• A. Culex
• B. Aedes
• C. Anopheles
• D. Mansonia

Answer: (A)

West Nile Virus spreads through a bird–mosquito cycle, and the mosquitoes that most effectively link that cycle to humans belong to the genus Culex. These mosquitoes are well-suited as vectors because they frequently feed on birds, where the virus amplifies, and then can transmit the virus to other hosts, including people, after taking a blood meal. In many regions, species such as Culex pipiens and related relatives are the dominant vectors, so they drive most West Nile transmission there. Other genera like Aedes are key for different viruses (such as dengue and Zika), Anopheles is associated with malaria, and Mansonia is not a primary West Nile vector, making them much less important for this virus.

West Nile Virus spreads through a bird–mosquito cycle, and the mosquitoes that most effectively link that cycle to humans belong to the genus Culex. These mosquitoes are well-suited as vectors because they frequently feed on birds, where the virus amplifies, and then can transmit the virus to other hosts, including people, after taking a blood meal. In many regions, species such as Culex pipiens and related relatives are the dominant vectors, so they drive most West Nile transmission there. Other genera like Aedes are key for different viruses (such as dengue and Zika), Anopheles is associated with malaria, and Mansonia is not a primary West Nile vector, making them much less important for this virus.