Gross and histopathology of avian pox in a feral pigeon (Columba spp) - a case report.
The present report pertains to the pathological investigation of pigeon pox in a feral pigeon. A feral pigeon (Columba spp) with lethargy and unable to fly was found in the premises of Indian Veterinary Research Institute (IVRI), Izatnagar, Bareilly, Uttar Pradesh. Pigeon exhibited yellowish nodular and proliferative lesions on the beak, eyes, and oral cavity. The bird died before being treated. During necropsy, the pigeon had both cutaneous and diphtheritic type (conjunctiva and oral cavity) of pox lesions. The eyes were swollen and congested with conjunctival epithelial proliferative lesions. On the beak, nodular yellowish cutaneous lesions that occlude the naris have been found. Dried crusty lesions were observed in the oral cavity and mucopurulent necrotic debris was found in the tracheal lumen. The histopathological changes such as epidermal epithelial hyperplasia and the presence of typical Bollinger bodies in markedly distended keratinocytes were recorded. The hyperplastic epidermis shows infiltration of mixed inflammatory cells (macrophages and heterophils) with necrosis. Lesions also revealed fibrinoheterophilic exudate accumulation adjacent to the hyperplastic epidermis. The pathological investigation confirmed the disease in pigeon as pigeon pox based on gross and histopathology.