Bovine tuberculosis and its control / by Veranus Alva Moore.

  • Veranus Alva Moore
Date:
1913
Catalogue details

Licence: Public Domain Mark

Credit: Bovine tuberculosis and its control / by Veranus Alva Moore. Source: Wellcome Collection.

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    tebrae and joints, and in the membranes covering the brain and spinal cord. In cases where there is no reaction the interpretation is more difficult. Formerly the assumption was that tuberculin will cause a reaction in all infected animals, and that if the animal does not react it is free from infection. But tuberculin does not give a reaction during the period of incubation. It does not give a reaction in most if not all cases where the disease has become arrested, encapsulated or healed.* It is stated on good authority that tuberculin does not give a reaction in certain cases where the disease is very far advanced. A number of veterinarians have reported cases of cattle that gave no reaction following the injection of tuber¬ culin, but which on slaughter and post mortem were found to be very extensively diseased. Dr. Wills, of the N. Y. State *In certain herds where the Bang method has been applied the results have been quite different respecting the original non-reacting animals. In one case where there were 17 reacting and 13 sound individuals, but one of the 13 subsequently reacted, although tested semi-annually for four years. In other herds a much larger percentage of the supposed sound animals reacted on subsequent tests. In a large herd of cattle tested there were 96 cows that did not react. These were placed by themselves in a practically new barn, and three months later, and every six months thereafter, the sound herd was tested. Those that responded were promptly removed and the stable was thoroughly dis¬ infected with a 5 per cent solution of carbolic acid after each test. The results of the consecutive tests of the non-reacting animals are exceedingly instructive. They are as follows: 1904. July.96 tested; 31 reacted, 65 did not react; 32.2% reacted. 1905. Jan. .65 a 8 ii 57 a < i i i 12.3 a July. .57 a 15 i < 42 i i 6 i i i 26.3 i i 1906. Jan. .42 a 15 i i 27 C i ii i i 35.7 a • July. .27 a 3 a 24 a ii a 11.1 a 1907. Jan. .24 a 2 a 22 ii ii i i 8.3 a July. .22 i i 1 a 21 a i i i t 4.5 i i 1908. Jan. .21 a 1 i i 20 a it a 4.7 i i Aug. .20 a 1 a 19 a ii a 5.0 a During this time the non-reacting animals were kept by themselves. There was no opportunity for infection after they were removed from the
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