Aspergillosis primarily affects which body system?

Aspergillosis is primarily a fungal infection caused by the Aspergillus species, which strongly targets the respiratory system. The spores of the Aspergillus fungus are commonly found in the environment, and when inhaled, they can lead to respiratory issues such as inflammation, infection, or allergic reactions. The respiratory system is particularly vulnerable because it is directly exposed to the airborne spores, making it the most affected body system.

In falconry, it is critical to be aware of respiratory health as raptors, due to their high metabolic rates and specialized respiratory systems, can suffer significantly from respiratory diseases, including aspergillosis. This infection can manifest in various forms, such as allergic aspergillosis or invasive aspergillosis, which can severely impact a bird's health if not diagnosed and treated promptly.

The other options—nervous, digestive, and circulatory systems—are not typically associated with aspergillosis, as this fungal infection does not primarily affect these systems in the way it does the respiratory system. Thus, understanding that aspergillosis primarily impacts the respiratory system is key for anyone involved in falconry and the care of birds of prey.