What is the most common vector-borne disease in the United States?

A. Lyme disease: Transmitted by ticks, Lyme disease is the most commonly reported vector-borne illness in the U.S. B. Rocky Mountain spotted fever: Also tick-borne, but less common than Lyme disease. C. Yellow Fever: Not endemic in the U.S.; cases are rare and usually travel-related. D. Malaria: Also not endemic in the U.S.; cases are typically from international travelers.