Final answer:
The causative agent of Q fever is Coxiella burnetii, a highly infectious zoonotic disease. It primarily affects farm workers and can lead to pneumonia and endocarditis.
Step-by-step explanation:
The causative agent of Q fever is Coxiella burnetii. It is a highly infectious zoonotic disease that farmers can contract from their animals by inhalation. Q fever primarily affects farm workers and can lead to serious complications, such as pneumonia and endocarditis.