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Anaplasmosis is an infectious disease of cattle that causes destruction of red blood cells. The disease is caused by a minute parasite, Anaplasma marginale, found in the red blood cells of infected cattle. It can be transmitted from infected animals to healthy animals by insects or by surgical instruments.

This material was compiled and adapted for use in Texas by Ronald J. Gill, Extension Livestock Specialist, Dallas. Editor: Elizabeth Gregory, Extension Communications Specialist. The information outlined in this publication was originally prepared by E.J. Richey, D.V.M., Extension Veterinarian, and Guy Palmer, D.V.M., Ph.D. Pathology, College of Veterinary Medicine, University of Florida, and appeared in the Southern Regional Beef Management Handbook (SR 6011) and E.J. Richey, 1992, “Bovine Anaplasmosis” In Proc. No. 24, American Association of Bovine Practitioners Annual Conference.