Licence: Public Domain Mark
Credit: State control of tuberculosis. Source: Wellcome Collection.
Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.
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![that the source of iiit'eetioii in these 100 cases was, in all probability, through the intestines. In fact, in many cases, he conld trace the infection from the in- testinal wall up through the mesenteric glands to distant organs of the Ijody. Woodhead also believes, from pathological e\idence, that infection not rarely takes place through the tonsils, this often being the soiuTe of the tul)ercTdar infection of the cervical glands. A great deal of experimental work has been done upon the jiroduction of tuberculosis hy way of the alimentary canal. A good many examinations have been made to determine the frequency Avith which tubercle bacilli may he expected in the milk supply. There has been much discussion as to the occurrence of the bacilli in the milk of tul)erculous animals. It has been claimed hy some that they will not ])e found in the milk unless the udder is iuAohed ; Init it has been shown that this is not true. Milk is much more likely to Ije tuberculous when the udder is seiiously involved, Init it does occur when no signs of disease can be detected. Ernst examined microscopically the milk of thirty-six animals, which were tuberculous but had sound udders and found bacilli in the milk of twelve. They were found equally in the milk itself and in the cream. In fifty-six samples of milk and thirtv-three sami)les of cream, taken from the general supply of the Cit}' of Boston, no bacilli Mere found on miscroscopical examination. The most certain way of detecting the presence of tubercle bacilli in milk or, in fact, in any material is by inoculating the same into animals. Ernst found in twenty-five inoculation ex- periments performed with milk from the Boston supply,](https://iiif.wellcomecollection.org/image/b21226209_0022.jp2/full/800%2C/0/default.jpg)
