Cyanosis of the head observed in cases of H5N7 highly pathogenic avian influenza strain

Subcutaneous hemorrhage characteristic of H5N7 strain of highly pathogenic avian influenza

Vesicle formation on the wattle of a bird infected with highly pathogenic avian influenza

Purulent conjunctivitis due to avitaminosis A

Incoordination and lateral recumbency in chicks may be due to avian encephalomyelitis, avitaminosis A, nutritional encephalomalacia or arenavirus infection

Severe pulmonary aspergillosis showing numerous nodular foci and confluent lesions

Characteristic 'hock sitting' posture of broiler with Mycoplasma synoviae arthritis

Decreased mineralization of the mandible and maxilla allows extensive lateral movement of the beak

Hen showing sternal recumbancy due to osteomalacia

Severe nephritis characterised by pallor and urate deposition may be associated with nephrogenic strains of infectious bronchitis, infectious bursal disease or water deprivation

Torticollis may be due to infection of the inner ear by E. coli or Pasteurella multocida. It has also been observed in flocks suffering from velogenic Newcastle disease

Enlargement of wattle due to Pasteurella multocida infection

Wing of 14-day old broiler showing edema, subcutaneous hemorrhage and transudate due to chick anemia virus

Mucosa of intestine showing lesions characteristic of necrotic enteritis

Caseous airsacculitis associated with Mycoplasma gallisepticum infection

Acute foamy airsacculitis due to Mycoplasma gallisepticum infection

Eimeria acervulina/mivati infection showing white foci visible through the serosa of the duodenum

Severe Eimeria tenella infection showing hemorrhagic ceca

Fatty liver syndrome in mature hens may result in rupture and hemorrhage into the body cavity

Characteristic mottled appearance of liver (subcapsular hemorrhage) associated with Adenoviral hepatitis infection and specifically HHS (Leechi disease)

Characteristic hydropericardium associated with Angara disease (Leechi disease)