Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 •06 INFECTIOUS DISEASES. of determining the presence of the organism which causes the dis- turbance. In all cases, in fact, the tubercle bacillus should be sought for in order to confirm the diagnosis. If this method cannot be employed, as for example in tubercu- losis of the liver, brain, etc., and the diagnosis is uncertain, the use of tuberculin constitutes the surest and easiest method of coming to a conclusion. Nocard's re- searches have shown' the precautions to be ob- served.
Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 •06 INFECTIOUS DISEASES. of determining the presence of the organism which causes the dis- turbance. In all cases, in fact, the tubercle bacillus should be sought for in order to confirm the diagnosis. If this method cannot be employed, as for example in tubercu- losis of the liver, brain, etc., and the diagnosis is uncertain, the use of tuberculin constitutes the surest and easiest method of coming to a conclusion. Nocard's re- searches have shown' the precautions to be ob- served. A minimum feb- rile re-action of 2' Fahr. (1-5° C.) is, however, necessary before the existence of the disease can be affirmed. Lastly, there remains a less rapid method, which aims at trans- mitting the disease to specially susceptible animals by inoculating with suspected materials, such as the nasal dis- charge, pus, milk or pulp of internal organs. This method is most valuable when bacterio- logical examination has failed and tuberculin has produced only doubtful results. The guinea-pig is the subject usually chosen, but some weeks, or even months, may elapse before definite results are obtained. In those forms where ordinary methods of investigation prove sufficient it is well to bear in mind the symptoms which difterentiate this disease from others closely resembling it. Pulmonary tuberculosis, for example, should always be suspected whenever there exists frequent coughing, nasal discharge and poor bodily- condition ; if in addition to this respiration is found on auscul- tation to be rough, inspiration hiterrupted or rasping, expiration Fig. 283.—Tuberculosis of the posterior mediastinal lymphatic glands in a sheep which had been kept for two years in company with some tuber- culous cows. PG, Left lung; PD, right lung; T, trachea; La, anterior lobes; L, middle cardiac lobes ; Lj, posterior lobes; G;«, tuberculous and enlarged posterior mediastinal lymphatic glan
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