Bovine anaplasmosis: susceptibility of seronegative cows from an infected herd to experimental infection with Anaplasma marginale.

S. D. Lincoln, J. L. Zaugg, John Maas

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Adult cows from an Anaplasma marginale-infected herd that were negative to the A marginale rapid card agglutination (RCA) and complement fixation (CF) tests for 1 to 4 years developed acute anaplasmosis after inoculation with 0.5 ml of blood from an A marginale carrier cow. The test cattle were as susceptible as the control cattle of similar ages. Also, 2 cows that had seroconverted from RCA/CF-positive to RCA/CF-negative status naturally were fully susceptible to anaplasmosis when they were experimentally infected. Results of the study indicated that indigenous seronegative cattle in anaplasmosis-enzootic regions probably do not have acquired or natural immunity to A marginale infection.

Original languageEnglish (US)
Pages (from-to)171-173
Number of pages3
JournalJournal of the American Veterinary Medical Association
Volume190
Issue number2
StatePublished - Jan 15 1987
Externally publishedYes

ASJC Scopus subject areas

  • veterinary(all)

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