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Tuberculin tests of all dairy cattle in Los Angeles County in 1942-43 revealed 47 reactors in 102, 548 animals (0.045%). Tests on 19, 840 dairy, cattle imported into the county disclosed 198 reactors (0.99%).
According to the rate of importation, the average period of usefulness of cows is only 2...

Hurt, L. M.
Los Angeles, Calif.,
County Live Stock Department. Review Covering Recent Field and Laboratory Work in Animal Disease Control 1942-1943., 1943, pp 55 pp.