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 language | English (US) |
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Pages (from-to) | 171-173 |
Number of pages | 3 |
Journal | Journal of the American Veterinary Medical Association |
Volume | 190 |
Issue number | 2 |
State | Published - Jan 15 1987 |
Externally published | Yes |
ASJC Scopus subject areas
- veterinary(all)