Aspergillosis is a disease affecting which system in birds?

• A. Digestive system
• B. Circulatory system
• C. Respiratory system
• D. Nervous system

Answer: (C)

Aspergillosis is a fungal infection that primarily attacks the respiratory tract in birds. Inhaled Aspergillus spores settle in the airways, lungs, and especially the air sacs, causing inflammation and granuloma formation that impairs airflow and gas exchange. Birds commonly show breathing difficulties, coughing or wheezing, nasal discharge, lethargy, and weight loss, often in stressed or captive birds with moldy, poorly ventilated environments. Because the avian respiratory system relies on efficient airflow, infection here quickly reduces performance and can be life-threatening. While other systems aren’t the main target, secondary involvement is possible in advanced cases; however, the hallmark signs are respiratory.