Zoonotic diseases,like West Nile virus,are concentrated in distinct regions and spread at different rates.The difference in the rate of spread is most directly related to

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The spread of zoonotic diseases, such as West Nile virus, is most directly related to the population of vectors (organisms that transmit the disease from one host to another, such as mosquitoes or ticks) in a given area. The more vectors present, the faster the disease is likely to spread. Therefore, choice C is the best answer. The type of pathogen, host's mobility, area temperature, and regional rainfall can all influence the spread of a disease, but they are not as directly related as the presence of vectors.

Zoonotic Diseases,like West Nile Virus,are Concentrated in Distinct Regions and Spread