Ranikhet - This ailment is the most perilous for chickens.

Bird flu - It's a lethal disease that affects chickens and other avian species.

Fowl pox - This condition manifests as small pustules on chickens.

Marek's disease - This affliction resembles cancer in chickens.

Chicken pox - It's a contagious viral ailment that spreads moderately.

Infectious bronchitis - This illness is a severe and highly contagious infection among chickens

Infectious coryza - This disease targets the upper respiratory tract of chickens and is transmitted by Hemophilus paragallinarum.