A symptom of fowl pox disease is the appearance of galls on the comb of infected birds.
Fowl pox is a viral disease that affects chickens and other poultry species. The virus is spread through bites from infected mosquitoes, or by direct contact with infected birds.
One of the most distinctive symptoms of fowl pox is the appearance of galls on the comb, which are raised, wart-like growths. These galls can be white, yellow, or grey in color and can become quite large, covering much of the comb.
Infected birds may also show other symptoms, such as a drop in egg production, a decrease in feed intake, and a drop in weight. However, the appearance of galls on the comb is often the most noticeable and easily recognized symptom of fowl pox.
In summary, the appearance of galls on the comb is a symptom of fowl pox disease in chickens and other poultry species.