Bovine tuberculosis in the United States
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Bovine tuberculosis in the United States

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      Tuberculosis in cattle has continued to decline, except during World War II, since the inauguration of the Federal control program known a s the Accredited Herd Plan of Bovine Tuberculosis Eradication in 1917. In 1917 it was officially estimated that 5 percent of the cattle of the Nation were infected with most of the animal infection concentrated in the Northeast and Midwest dairy States. In some of the older dairy sections, 50 to 100 percent of the cattle were infected. By 1934 the infection rate had dropped to 1.1 percent and by November 1940 all the counties of the United States had become modified accredited areas with less than one-half of 1 percent of the cattle reacting. It was estimated that less than 0.4 percent of the dairy cows and 0.05 percent of the beef cattle were infected in 1940. The U. S. Department of Agriculture, Bureau of Animal Industry, reports that for the 12-month period ending June 30, 1950 there were more than 9,000,000 cattle tested of which 0.19 percent or 17,733 were reactors. This is practically the same percentage found during the past two years but lower than 1945-1947 when the rate rose to over 0 .2 percent.
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