TUBERCLE BACILLI IN MILK, ETC. 31 
Table showing Results of Milk from 24 Cows whose Udders were Suspicious 
Milk, from udders. 
No. of 
samples. 
Producing tuberculosis. 
Actual 
number. 
Percentages. 
A. Certainly diseased 
B. Probably diseased ... 
C. Healthy 
10 
9 
5 
50.0 
I i.i 
Total 
24 
6 
Rabinowitsch and Kempner's* researches were most complete. Fifteen Cows were tested 
with tuberculin giving a distinct reaction. Three months later samples of their milk were tested, 
and that of 10 of them (66.6 per cent.) proved to be tuberculous. At the time tJie milk was taken, 
and previously, clinical examinations of the animals were made, and, in cases of death, post-mortem 
examinations. The results were as follows : — {a) Only one Cow showed distinct tuberculous udder 
lesions clinically (besides lung symptoms) ; her milk (two samples) proved to be infective, [h) One 
Cow showed, microscopically, only tuberculosis of the udder (clinically and post-mortem advanced 
disease of organs) ; the milk was found to be tuberculous, {c) Three Cows showed advanced 
general tuberculosis, the udder histologically exhibiting chronic interstitial inflammation without 
tuberculous deposits ; the milk of all three was found to be tuberculous, {d) One Cow with lung 
lesions and some emaciation ; the milk was found to be tuberculous. (f) One Cow showed 
symptoms of commencing lung lesions ; the milk proved to be tuberculous. (/") One Cow on 
first examination was suspected ; on two subsequent examinations the animal seemed normal ; the 
milk was found to be tuberculous, (g) Two animals showed no symptoms on three examinations 
extending over a period of five months, but their milk proved to be tuberculous. (/;) Four others, 
three showing clinical signs and one none, gave non-tuberculous milk (four, two, two, and two 
samples respectively). (/) In one other case, exhibiting post-mortem acute and chronic lesions, 
the inoculation experiments on Guinea-pigs failed from the presence of a pathogenic coccus. 
Therefore, omitting the last case, 10 out of 14 animals (71.4 per cent.), all of which had reacted 
to tuberculin, yielded tuberculous milk. More experimental work is evidently desirable ; but one 
must clearly infer from these experiments that any animal which reacts to tuberculin indicating 
lesions which, may be, cannot, even by repeated clinical examination, be detected, is capable of 
giving milk, which will produce tuberculosis in the Guinea-pig on inoculation. 
In contrast to Rabinowitsch's results OsTERTAot concludes, from experiments with the 
milk of 50 animals which reacted to tuberculin but showed clinically no sign of disease, that the 
milk of such animals is absolutely non-infectious for Guinea-pigs. 
* 'Zeitschrift fiir Hygiene,' 1889, Band i, p. 145. 
t 'Zeitschrift fiir Fleisch- iind Milchhygiene,' 1899, p. zzi. 
