Which disease is indicated by chickens showing swollen waddles, swollen joints, and nasal discharge?

The signs presented—swollen waddles, swollen joints, and nasal discharge—are indicative of Chlamydiosis, also known as Psittacosis. This disease is caused by the bacterium Chlamydia psittaci and is known to affect various bird species, including chickens. The clinical manifestations often include respiratory symptoms such as nasal discharge, as well as systemic signs like swollen joints and tissues, which account for the swollen waddles.

While the other diseases listed can also present with distinct clinical signs in poultry, they do not align as closely with the combination of symptoms mentioned. Avian Influenza typically presents with severe respiratory distress and high mortality, Newcastle Disease can result in nervous system signs and is associated with respiratory symptoms but manifests differently, and Infectious Bursal Disease primarily affects the immune system and does not usually present with swollen waddles or nasal discharge.

Therefore, the specific combination of the symptoms in the question is most accurately associated with Chlamydiosis/Psittacosis.