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Finite purification of Anaplasma marginale: serologic inactivity of the anaplasma body
Abstract:
Anaplasma bodies finitely purified by affinity chromatography to eliminate all traces of erythrocytic stromata were not agglutinated by serum from calves having acute anaplasmosis. The stromata which were associated with the anaplasma bodies were also finitely purified and agglutinated with such serum. The evidence indicates that the antibody in anaplasmosis that is detected by agglutination tests is directed against the erythrocytic stromata and not against the finitely purified anaplasma bodies.
Insights
Antibodies detected in anaplasmosis agglutination tests target erythrocytic stromata, not purified Anaplasma bodies. This finding clarifies the serological response in anaplasmosis diagnostics.
Area of Science:
- Veterinary Immunology
- Parasitology
- Bacteriology
Background:
- Anaplasmosis is a significant tick-borne disease affecting cattle.
- Current diagnostic methods often rely on agglutination tests to detect antibodies.
- The specific target of antibodies in these tests has been debated.
Purpose of the Study:
- To determine whether antibodies detected in anaplasmosis are directed against Anaplasma bodies or host cell components.
- To clarify the antigenic targets relevant for anaplasmosis serodiagnosis.
Main Methods:
- Purification of Anaplasma bodies using affinity chromatography to remove erythrocytic stromata.
- Purification of Anaplasma-associated stromata.
- Agglutination testing of purified Anaplasma bodies and purified stromata with serum from acutely infected calves.
Main Results:
- Purified Anaplasma bodies did not agglutinate with serum from anaplasmosis-affected calves.
- Purified erythrocytic stromata, even those associated with Anaplasma, strongly agglutinated with the same serum.
- The results indicate antibodies are directed against host cell components.
Conclusions:
- The antibody detected by standard agglutination tests in anaplasmosis is primarily against erythrocytic stromata.
- This suggests a need to re-evaluate the specificity of current diagnostic antigens for Anaplasma.
- Future diagnostic development may need to focus on Anaplasma-specific antigens rather than host-derived ones.