Photographic representation of histopathological lesions of different poultry diseases. (A) Severely congested lungs and alveolities were observed in lungs, caused by AI. (B) Severe hemorrhage and congestion in lungs were observed in case of ND. (C) Hemorrhagic and destruction of epithelial lining were observed in trachea of ILTV infected chicken. (D) Severe hemorrhage and congestion were observed in the lungs, and fibrinous layer were evident in the periphery of lungs in case of mycoplasmosis in chicken.