Manual of veterinary microbiology / by Professors Mosselman and Liénaux ; translated and edited by R.R. Dinwiddie.

  • Mosselman, Gustave.
Date:
1894
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Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: Manual of veterinary microbiology / by Professors Mosselman and Liénaux ; translated and edited by R.R. Dinwiddie. Source: Wellcome Collection.

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    pected from their physical characters to be of a tuber- cular nature. In the case of young, gray tubercles it suffices to spread upon a cover glass the product obtained by scraping their cut surface: the bacilli are here uni- formly distributed. But when the tubercles are al- ready caseated the caseous matter frequently contains but few bacilli except in birds, where, on the contrary, they are very numerous; this substance is first re- moved and the bacilli sought for in the wall of the caseous tubercle. The same method may be employed for cavities although these often contain a liquid very rich in bacilli. Experimental inoculations.—Tuberculosis is inocula- ble to the horse, ass, ox, sheep, pig, dog, cat, rabbit, guinea pig, and to fowls. Subcutaneous inoculation is without effect in the horse, ass, sheep, pig, dog, cat, and chicken. Ingestion of virulent substances produces the dis- ease, but not in all cases, in the horse, sheep, pig, dog, and cat. Cattle are easily tuberculized in this way. The chicken remains unaffected when sputa or tuber- cular products of mammals are mixed with its food. Intravenous injection gives much surer results. Except in the case of birds it is almost invariably fol- lowed by a generalized tuberculosis of the lung with possible extension to* other organs. In the ass the experiments of M. Chauveau have shown that these pul- monary granula heal spontaneously after a few weeks. Fowls do not usually contract the tuberculosis of mammals by way of the circulation. Thus, MM. Cadiot, Gilbert, and Roger have recently announced that out of forty pullets inoculated by them either in