title: Dynamics of IgG1 and IgG2 subclass response in dogs naturally and experimentally infected with Ehrlichia canis.
abstract: Immunoglobulin (Ig) G subclasses were measured in dogs naturally and experimentally infected with Ehrlichia canis using enzyme-linked immunosorbant assay (ELISA). In this study, a higher IgG2 subclass response was noticed to natural and experimental E. canis infection in dogs. Anti-E. canis-IgG2 optic density (OD) values were found to be significantly higher than anti-E. canis-IgG1 during the different phases of the disease, and no differences in the IgG subclass responses to E. canis infection were found between symptomatic and asymptomatic dogs. Doxycycline treatment, which eliminated the rickettsia in three of four persistently infected dogs, had no noticeable influence on the E. canis-IgG subclass OD values during the treatment period. In order to facilitate the study, an ELISA for the detection of anti-E. canis IgG was developed and was shown to be sensitive and specific for E. canis-IgG, and in a significant correlation with the indirect immunofluorescence antibody test.
authors.affiliation: Department of Clinical Sciences, School of Veterinary Medicine, Hebrew University of Jerusalem, PO Box 12, 76100, Rehovot, Israel. harrus@agri.huji.ac.il
authors.forename: S
authors.initials: S
authors.lastname: Harrus
authors.forename: T
authors.initials: T
authors.lastname: Waner
authors.forename: D
authors.initials: D
authors.lastname: Strauss-Ayali
authors.forename: H
authors.initials: H
authors.lastname: Bark
authors.forename: F
authors.initials: F
authors.lastname: Jongejan
authors.forename: G
authors.initials: G
authors.lastname: Hecht
authors.forename: G
authors.initials: G
authors.lastname: Baneth
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D004283:Dog Diseases / Q000188:drug therapy / Q000276:immunology*; D004285:Dogs; D004318:Doxycycline / Q000627:therapeutic use; D004536:Ehrlichia / Q000276:immunology*; D016873:Ehrlichiosis / Q000188:drug therapy / Q000276:immunology / Q000662:veterinary*; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods / Q000662:veterinary*; D019084:Fluorescent Antibody Technique, Indirect / Q000662:veterinary; D007074:Immunoglobulin G / Q000032:analysis / Q000096:biosynthesis*; D012680:Sensitivity and Specificity
chemical_list: D000900:Anti-Bacterial Agents; D007074:Immunoglobulin G; D004318:Doxycycline