Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 mFECTlOlTS DISEASES. second or two, but when the epithelium has been shed as a conse- quence of laryngitis or pharyngitis, infection may occur. As regards cutaneous inoculation, the parasite only seems dan- gerous when the skin is excoriated or injured either accidentally or as the result of surgical interference. Actinomycosis of the lung is probal)ly caused by the germs being inhaled along with the inspired air. Lesions. The lesions are very pe- culiar in character, and end in com-
Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 mFECTlOlTS DISEASES. second or two, but when the epithelium has been shed as a conse- quence of laryngitis or pharyngitis, infection may occur. As regards cutaneous inoculation, the parasite only seems dan- gerous when the skin is excoriated or injured either accidentally or as the result of surgical interference. Actinomycosis of the lung is probal)ly caused by the germs being inhaled along with the inspired air. Lesions. The lesions are very pe- culiar in character, and end in com- pletely destroying the tissues invaded. Once lodged within an organ, the disease shows a tendency to ex- tend in all direc- tions, and, despite the defensive reac- tion of the tissues, it soon forms numerous parasitic centres. In bones, for example, actinomy- cosis invades the spongy tissue with the greatest ease. It causes subacute ostitis, which leads to diffuse suppura- tion and local hypertrophy of the bone, destruction of the compact layers, and the development of an abscess with fungoid, exuberant, granulating walls which show no reparative tendency whatever. The pus of the abscess and the liquid from the fistula contain varying quantities of yellowish grains, representing clusters of actino- myces. The surrounding tissues, muscles, tendons, skin, etc., are all involved before long in the inflammatory process, and the granulating masses themselves are invaded by the yellowish parasitic tufts. All the fistulse are surrounded by enormous zones of iniiltration, which on 274.—Old-standing bone lesions in a case of actinomycosis of the jaw.
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