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Immunity patterns during acute infection by Eimeria bovis.

H P Hughes1, W M Whitmire, C A Speer

  • 1Veterinary Research Laboratory, Montana State University, Bozeman 59717.

The Journal of Parasitology
|February 1, 1989
PubMed
Summary

This study on Eimeria bovis infection in calves found that while antibody levels peaked early, cellular immunity remained strong, suggesting it

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Area of Science:

  • Veterinary Immunology
  • Parasitology
  • Bovine Health

Background:

  • Eimeria bovis is a significant protozoan parasite causing coccidiosis in cattle.
  • Understanding the host immune response is crucial for developing effective control strategies.

Purpose of the Study:

  • To investigate the cellular and humoral immune responses in bull calves following Eimeria bovis inoculation.
  • To determine the role of different immune components in combating E. bovis infection.

Main Methods:

  • Bull calves were inoculated with Eimeria bovis oocysts.
  • Serum IgG antibody titers against merozoites and sporozoites were measured.
  • Lymphocyte proliferation assays were performed using concanavalin A and E. bovis antigen (EbAg).

Main Results:

  • Serum IgG peaked between 10-20 days post-inoculation, coinciding with oocyst shedding.
  • Anti-merozoite titers remained elevated longer than anti-sporozoite titers.
  • Lymphocyte responses to EbAg remained elevated throughout the study, indicating sustained cellular immunity.

Conclusions:

  • Eimeria bovis sporozoites and merozoites share common antigens.
  • No significant immunosuppression was observed during acute infection.
  • Cellular immunity likely plays a more critical role than humoral immunity in resistance to E. bovis reinfection.

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