Natural Poxvirus infection in a lark [Melanocorypha bimaculata)

摘要

Khordadmehra M, Ranjbarb VR, Shahbazi R, Najafi MZ, Helana JA., Natural Poxvirus infection in a lark (Melanocorypha bimaculata)., Onl J Vet Res., 19(8): 561-566, 2015. Avian pox is caused by DNA viruses of the family Poxviridae and genus Avipoxvirus which infects animals and birds. We report natural poxvirus infection determined by PCR and histopathology in a bimaculated lark (Melanocorypha bimaculata). A lark without clinical signs presented a large brown cutaneous mass with rough nodular surface in one leg. At necropsy, the mass measured 1.3x1.3 cm with a thick scab, ulcer and a secondary infection on the surface. Sectional cut of the mass was discrete, round, white to gray, firm and with no liquefied foci in the center. Grossly, all visceral organs,liver, kidney and respiratory systems appeared normal. Histological examination revealed severe hypertrophy and hyperplasia of the epidermis, degeneration of epithelial cells with large eosinophilic inclusion Bollinger bodies distending the cytoplasm. Heterophil-rich inflammatory cells were present in the dermis. PCR test revealed a typical 578 base pair of Canary Pox Virus DNA in tissue samples.