Poultry Judging Practice Test

Which of the following is not considered a respiratory disease?

1. Bronchitis

2. Newcastle Disease

3. Leukosis

4. Avian Influenza

The correct answer is: Leukosis

Leukosis is not classified as a respiratory disease because it is primarily a viral infection that affects the immune system and can lead to tumors in various organs, particularly the lymphoid tissues. In contrast, bronchitis, Newcastle Disease, and Avian Influenza are all respiratory diseases that directly affect the respiratory systems of birds, leading to symptoms such as coughing, sneezing, nasal discharge, and difficulty breathing. Bronchitis, caused by the infectious bronchitis virus, specifically targets the respiratory tract. Newcastle Disease is a viral infection that can cause severe respiratory distress along with neurological signs. Avian Influenza, commonly known as bird flu, also affects the respiratory system and can be very severe in birds, sometimes resulting in high mortality rates. Thus, while the other options are associated with respiratory symptoms and complications, leukosis has a different pathophysiology, predominantly involving neoplastic processes rather than respiratory impairment.