The agency most associated with responding to outbreaks of vector-borne diseases, like West Nile Virus, in the United States is:

• A. FDA
• B. NIH
• C. CDC
• D. WHO

Answer: (C)

Public health response to vector-borne disease outbreaks in the United States is led by the Centers for Disease Control and Prevention. The CDC collects nationwide data on arboviruses like West Nile Virus, runs surveillance systems, and provides guidance on prevention, testing, and mosquito control. They coordinate investigations and resources with state and local health departments to implement control measures and public communication. Since West Nile Virus is transmitted by mosquitoes, this kind of coordinated surveillance, vector management guidance, and outbreak response is exactly what the CDC specializes in domestically. The FDA focuses on regulating foods, drugs, and medical devices rather than outbreak response; the NIH emphasizes research; and the WHO is an international organization that supports member states rather than leading domestic responses.