. Diseases of domesticated birds. Poultry; Poultry; Birds. AVIAN DIPIITIIEEIA AND BIRD POX 103 into a hard dry scab. After seven to nine days this scab may be easily removed leaving a whitish area only slightly elevated above the surface and usually pitted. The scabs retain the virus of the disease and Avhen rubbed on the scarified skin or mucous membrane. Fig. 9. Head of a turkey affected with epithelioma contagiosum (bird pox). (Klee) of the mouth, even after a period of five years, may reproduce typical lesions. Haring and Kofoid describe the microscopic structure of chicken pox tissue as f
. Diseases of domesticated birds. Poultry; Poultry; Birds. AVIAN DIPIITIIEEIA AND BIRD POX 103 into a hard dry scab. After seven to nine days this scab may be easily removed leaving a whitish area only slightly elevated above the surface and usually pitted. The scabs retain the virus of the disease and Avhen rubbed on the scarified skin or mucous membrane. Fig. 9. Head of a turkey affected with epithelioma contagiosum (bird pox). (Klee) of the mouth, even after a period of five years, may reproduce typical lesions. Haring and Kofoid describe the microscopic structure of chicken pox tissue as follows: " The epithelial tumors are produced by a hyperplasia of the epithelium due to an increase both in the size and number of cells. The zone of growth is in the stratum of Malpighii, the principal region of prolifera- tion being in the outer edges from which the cells increase in both direc- tions. A proliferating epithelium forms cell nests surrounded by thick bands of connective tissue, which contain blood vessels with thickened walls. The rapidly proliferating peripheral cells of the Malpighian layer are seen thickly studded with granules. The nucleus contains deeply staining chromatin bodies which are in an active process of proliferation. Ivaryokinetic figures are common in this region. More deeply in the epithelial tumor mass the cells are greatly increased in size and haA^e rela- tively fewer granules. The nuclei are nale and show little evidence of cell division. In these cells, are large cell inclusions which are very strik- ing in appearance, and which Eeischauer and others have thought to be protozoa. There is usually but one of these bodies in each cell. They vary in size from five to twenty microns, most of them are round, al- though some of them are quite irregular in shape. They are evidently fatty in structure as they stain black with osmic acid. When eosin and methylene blue are iised, they stain a faint pink, resembling somewhat the Negri bodies foun
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirds, booksubjectpou
