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Value of serologic reactions at 2 months following strain 19 vaccination of cattle herds with brucellosis



Value of serologic reactions at 2 months following strain 19 vaccination of cattle herds with brucellosis



Preventive Veterinary Medicine 5(4): 275-280



Non-reactor cows in a dairy herd and six beef herds quarantined because of brucellosis were vaccinated with Brucella abortus Strain 19 and tested by rivanol and complement-fixation (CF) tests. Cows with rivanol 100 and CF 80 test titers at 2 months post-vaccination (p.v.) were defined as test positives. In the dairy herd, 46 test positives were diagnosed as follows: 17 (37%) had field strain infection; 1 (2%)had a Strain 19 infection; an additional 18 (39%) were brucellosis reactors at 4 months p.v.; 10 (22%) had declining or negative serologic tests at 4 months p.v. In the beef herds, 58 tests positives were diagnosed as follows: 19(33%) had field strain infection; 5 (9%) had Strain 19 infection; an additional 21 (36%) were brucellosis reactors at 6 months p.v.; 13 (22%) had declining or negative serologic tests at 6 months p.v. Since the majority of the test-positive cattle were diagnosed as either infected with B. abortus or brucellosis reactors, segregation of these cattle should reduce field strain exposure for the remaining cattle in the herd and therefore reduce the number of new cases of brucellosis.

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Accession: 006889506

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DOI: 10.1016/0167-5877(88)90013-x



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