title: Conserved recombinant antigens of Anaplasma marginale and Babesia equi for serologic diagnosis.
abstract: The competitive inhibition ELISA (CI-ELISA) format overcomes problems associated with antigen purity since the specificity of the CI-ELISA depends solely on the monoclonal antibody (mAb) used. Therefore, the CI-ELISA format is well suited for use with recombinant antigens. Molecular clones expressing a conserved 19 kDa protein of Anaplasma marginale and a 34 kDa protein of Babesia equi were derived and characterized. The 19 kDa A. marginale protein, conserved in all recognized Anaplasma species, and present in the infected tick salivary gland, was reactive with all bovine immune sera tested. The 34 kDa B. equi protein contains a protein epitope bound by antibody in equine immune sera from 19 countries. Monoclonal antibodies reactive with these proteins were derived and applied with recombinant copies of the 19 kDa A. marginale and 34 kDa B. equi proteins in a CI-ELISA format.
authors.affiliation: Animal Disease Research Unit, US Department of Agriculture, Pullman, WA 99164-7030, USA.
authors.forename: D P
authors.initials: DP
authors.lastname: Knowles
authors.forename: L E
authors.initials: LE
authors.lastname: Perryman
authors.forename: T F
authors.initials: TF
authors.lastname: McElwain
authors.forename: L S
authors.initials: LS
authors.lastname: Kappmeyer
authors.forename: D
authors.initials: D
authors.lastname: Stiller
authors.forename: G H
authors.initials: GH
authors.lastname: Palmer
authors.forename: E S
authors.initials: ES
authors.lastname: Visser
authors.forename: S G
authors.initials: SG
authors.lastname: Hennager
authors.forename: W C
authors.initials: WC
authors.lastname: Davis
authors.forename: T C
authors.initials: TC
authors.lastname: McGuire
mesh_terms: D000595:Amino Acid Sequence; D000712:Anaplasmosis / Q000175:diagnosis*; D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology*; D001404:Babesiosis / Q000175:diagnosis*; D002417:Cattle; D017124:Conserved Sequence; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D012469:Salivary Glands / Q000382:microbiology; D012698:Serologic Tests; D013987:Ticks / Q000382:microbiology
chemical_list: D000942:Antigens, Bacterial