Final answer:
Cat fleas in Tennessee mainly transmit cat-scratch disease, which is caused by Bartonella henselae. The diseases listed in the question's options are transmitted by other vectors such as ticks and mosquitoes, not cat fleas.
Step-by-step explanation:
In Tennessee, cat fleas are a medical concern because they transmit cat-scratch disease (CSD). This condition is not one of the options provided in the multiple-choice question. However, to clarify, cat-scratch disease is caused by the bacterium Bartonella henselae and is associated with flea feces on cats that can infect humans through bites or scratches. The diseases listed in the options such as Lyme disease, plague, Rocky Mountain spotted fever, and Zika virus are transmitted by other vectors, not cat fleas. Specifically, Lyme disease and Rocky Mountain spotted fever are transmitted by ticks, plague is transmitted by fleas, but typically from rodents like prairie dogs and not domestic cats, and Zika virus is transmitted by mosquitoes.