Avian Pathology PDF

Disease What does it look like Lesions Clinical signs Pathogenesis/causes Diagnosis Black head disease - multifocal to coalescing, well - droopy wings - histomonas melegridis -...

Disease What does it look like Lesions Clinical signs Pathogenesis/causes Diagnosis Black head disease - multifocal to coalescing, well - droopy wings - histomonas melegridis - post mortem via typical lesions demarcated, flat, irregularly - Unkempt feathers - Spread by roundworm - in liver + caecae round, red-beige areas - Yellow droppings Heterakis gallinarum - Histopathology of liver or blind bordered by a beige trim gut - Multifocal to coalescing - PCR necroheamorrhagic hepatitis Duck enteritis - multifocal random, small well - high mortality rate - mardivirus anatidalpha 1 - post mortem examination demarcated areas of - Photophobia - Induces vascular damage esp - Viral isolation hepatocellular degeneration + - Inappetence in smaller blood vessels necrosis characterised by loss - Extreme thirst of normal hepatic architecture - Droopiness - Few large, discrete clear - Ataxia vacuoles which displace - Nasal discharge nucleus - lipid degeneration - Soiled vents - Diarrhoea Avian pox virus - multifocal to coalescing, well - warty growths - avipoxvirus - virus isolation demarcated, round, raised, - Weakness - Biting insects, direct contact, - PCR testing firm, grey pitted nodules + - Laboured breathing indirect contact, aerosols - Microscopic evaluation of plaques - Emaciation spread virus biopsy - Mutlifocal to coalescing - Death proliferative dermatitis Gout - enlarged, deformed + swollen - painful joints - diet - post mortem examination joints - Weight loss - Genetics - Microscopic examination - Increased thirst - Environmental toxins - Ruffled feathers - Infectious agents - IB - Lameness - Dehydration Disease What does it look like Lesions Clinical signs Pathogenesis/causes Diagnosis Ovarian adenocarcinoma - tumour of the ovary, oviduct - abdominal discomfort - age - post mortem or both - Pelvic pain - Weight - Can metastasise to lungs, liver - Urinary symptoms - Genetics + peritoneal cavity - Appetite changes - Firm, solid, light beige tumours - Nausea - Cysts - Diarrhoea - Constipation Lymphoma - multifocal firm pale tan - inappetence - mareks disease - pathological findings nodules diffusely affecting liver - Weakness - Avian leukosis virus - Histological examination - diarrhoea - Reticuloendotheliosis virus - Dehydration - Emaciation Aspergillosis - white to yellow nodules, - coughing - fungal disease - lesions multifocal + diffuse - Lethargy - Incubation period is 2-5 days - Tail bobbing - Gasping - Cyanosis - Sudden death - Paralysis