Aspergillosis is a disease that affects which system in birds?

Aspergillosis primarily affects the respiratory system in birds. It is caused by the fungus Aspergillus, which can be inhaled when birds are exposed to contaminated environments such as moldy food or bedding. Once the spores are inhaled, they can colonize the lungs and air sacs, leading to respiratory distress, coughing, and other related symptoms.

Understanding this disease's impact on the respiratory system is crucial for early identification and treatment in avian patients. Addressing potential sources of fungal exposure, providing a clean environment, and ensuring good husbandry practices can help prevent the occurrence of aspergillosis in birds. The other systems listed, such as the nervous or digestive systems, are not primarily impacted by this fungal infection, which helps clarify why the respiratory system is the most relevant answer in this context.