Final answer:
Fleas can cause alopecia in cats due to the severe itching and scratching they induce, which leads to hair loss. They can also spread Bartonella henselae, causing cat-scratch disease.
Step-by-step explanation:
True, fleas can indeed contribute to alopecia (hair loss) in cats. This is because fleas can cause severe itching and scratching which leads to hair loss and can also induce an allergic reaction known as flea allergy dermatitis. Furthermore, infectious agents like facultative intracellular bacteria such as Bartonella henselae, which causes cat-scratch disease, can be transmitted by fleas and result in various health issues for both cats and humans when introduced into a wound.