Serologic and bacteriologic test results after adult vaccination with strain 19 in three dairy herds infected with brucellosis.

R. E. Breitmeyer, D. W. Hird, Tim Carpenter

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Milk culture data and serologic test results were evaluated after adult vaccination with Brucella abortus strain 19 in cattle of 3 large California dairy herds infected with brucellosis. Strain-19 organisms were isolated by culture of milk from 1.9% of the vaccinated cows. Isolation of field strain of B abortus varied directly with magnitude of complement-fixation (CF) and rivanol titers. At time of milk culture, 74% of cows from which field strain was isolated had CF titer greater than or equal to 160, compared with 58% of cows from which strain 19 was isolated. Cows with CF titer greater than or equal to 160 at 2 months or greater than or equal to 80 to 4 months after adult vaccination were more likely to be correctly classified as reactors (on the basis of subsequent milk culture results and/or persistently high serologic titer) than were cows with lower CF titer at these times. Cows from which B abortus strain 19 was isolated from milk were more likely to maintain persistent serologic titer than were cows from which neither strain of B abortus was isolated.

Original languageEnglish (US)
Pages (from-to)806-811
Number of pages6
JournalJournal of the American Veterinary Medical Association
Volume200
Issue number6
StatePublished - Mar 15 1992
Externally publishedYes

ASJC Scopus subject areas

  • veterinary(all)

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