Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Merozoite Proteins for Use in Detection of Babesia Equi in Horses Using Immunological Techniques
See also: US Patent Office Full Record

Southeast Area

Patent Number: 5643737
Docket Number: 9395
Serial Number: 8400413
Date Patented: 07/01/1997

Agricultural Research Service
July 1, 1997

Equine babesiosis, caused by Babesia equi or Babesia caballi, is a tick-borne hemoprotozoan disease of horses. Clinical disease is characterized by fever, anemia, and icterus. Mortality rate is high during initial infection of horses introduced into enzootic regions, and horses which survive initial infection are protected from clinical disease upon subsequent challenge. Horses with antibody to either parasite are restricted from importation into the United States. The complementation fixation test (CFT) is presently used for detecting antibody to B. equi or B. caballi in the serum of potentially infected horses. However, this test is not wholly accurate, and false-negative results are possible. The invention provides a novel, cloned protein isolated from the merozoite of B. equi. The protein contains a conserved region found in all strains of B. equi. The protein has been proven to be a sensitive and specific indication of the presence of antibodies to B. equi in the serum of potentially infected horses in various tests, including a test wherein the serum of 154 potentially infected horses were evaluated using the invention's protein in a competitive inhibition enzyme-linked immunosorbent assay (CI ELISA). The protein can also be used to raise antibodies specific to B. equi.

Donald P. Knowles Lance E. Perryman
Animal Disease Research Unit (Same as first inventor)
337 Bustad Hall (509) 335-3193
Washington State Universotu
Pullman, WA 99164
509-335-6029; 509-335-8328 (fax)

Industry Keywords:

veterinary diagnostics, animal import, anamal transport industry

Last Modified: 10/1/2015
Footer Content Back to Top of Page