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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![tliut three gave jKJsitive results. Kaiitliaek, experi- menting in Camljridge, England, found infection in nine out of sixteen dairies supplying that town. The milk, however, was not very thoroughh' impregnated, as only a very few of the animals inoculated succmnljed to the disease. It has been shown experimentally in reii;ard to the tuljercle Ijacillus in milk as, indeed, it has to the cultures of many other bacteria, that the greater the dilution and the smaller the dose, the less the chance of infection. Kanthack. as well as p]rnst, has shown that the Ijacilli are found in cream as well as in the whole milk, l)ut when milk is put through a centrifugal machine, the larger ptirt of the bacilli are renio\ed in the sediment. Experiments in Germany have shown that butter may contain tubercle bacilli. A number of other experimentors, as well as Ernst, have found 1)acilli in milk, when the udders were apparently healthy, and. in fact, when tuberculosis could only be detected by the tuljerculin test. It must l)e admitted, then, that we have pretty strong- evidence that if a dairy herd has in it tuberculous animals, the milk fnjm that herd stands a very good chance of being infected. The more disease there is in the herd, and the farther advanced it is, the greater the danger. ~- The fact that tul)ercle bacilli are found in milk and may, by injection into the lower animals, cause tuber- culosis, does not prove that milk would cause the disease if taken into the alimentary canal. Of course, many feeding experiments have Ijeen undertaken with milk and other products from tuberculous animals. These have not always been successful. Smith, Law, Nocard,](https://iiif.wellcomecollection.org/image/b21226209_0023.jp2/full/800%2C/0/default.jpg)
