What is a common source of Ornithosis-rickettsial infection?

Ornithosis, also known as psittacosis, is primarily associated with infections transmitted to humans from birds, particularly through their droppings. The correct choice highlights the significance of contact with infected bird droppings as a common source of infection. When bird droppings dry and become aerosolized, they can release pathogenic bacteria into the air, which may then be inhaled by humans, leading to respiratory infections. This transmission route is crucial because it underscores the importance of hygiene and protective measures when handling birds or cleaning areas where birds have been present.

While other sources of infection such as contaminated air or water can contribute to various illnesses, they are not specifically linked to Ornithosis-rickettsial infections in the same direct way as infected bird droppings. Therefore, understanding the specific behaviors and risks associated with avian species is vital for preventing the spread of this infection.