TEDA Emerging And Exotic Diseases Of Animals (EEDA) Exam 1 Practice

West Nile virus introduction most plausible host/vector combination.

Infected mosquitoes and birds Infected humans Infected horses Any infected mammal

Correct Answer:

Infected mosquitoes and birds

Explanation:

West Nile virus is mainly spread through a bird–mosquito cycle. Birds develop high enough viremia to infect feeding mosquitoes, which then pass the virus to other birds. Humans and horses can get infected, but they do not reach sufficient viremia to infect mosquitoes, so they don’t sustain transmission. This makes an infected mosquito introducing the virus to a susceptible bird population the most plausible way the virus gets established in a new area. Infected mammals are not effective at propagating the cycle, and “any infected mammal” would not support ongoing transmission.

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