title: Utility of an immunocapture-agglutination test and an enzyme-linked immunosorbent assay test against cytosolic proteins from Brucella melitensis B115 in the diagnosis and follow-up of human acute brucellosis.
abstract: The utility of an immunocapture-agglutination (Brucellacapt, Vircell SL, Granada, Spain) test and an enzyme-linked immunosorbent assay IgG, IgA, and IgM (ELISA-IgG, ELISA-IgA, ELISA-IgM) against cytosolic proteins from Brucella melitensis B115 (R) was compared with ELISA-IgG, ELISA-IgA, and ELISA-IgM against smooth lipopolysaccharide (S-LPS) from B. melitensis 16M (S), serum agglutination test (SAT), and Coombs test in the diagnosis and follow-up for 10 months of 51 patients with acute brucellosis. The sensitivities of ELISA tests against cytosolic proteins varied from 49.0 % for ELISA-IgG to 64.7% for ELISA-IgM and were lower than the sensitivities showed by ELISA S-LPS (from 88.2% to 92.2%), SAT (88.2%), Coombs (96.1%), and Brucellacapt (98.0%) tests. Specificity was over 93% in all cases. The evolutionary behavior of the SAT, Coombs, and Brucellacapt tests was similar. There was a decrease of between 20% and 40% in antibody titer in the 10th month of evolution after treatment. The evolutional curves of IgG, IgA, and IgM against cytosolic protein increased slightly till the eighth month. The specific IgM and IgA antibodies against protein fractions began to show a drop from the eighth month on, showing levels slightly lower than the initial sera values by the end of the 10th month. In this month, titers of specific IgG against proteins fractions remained higher than the titers showed by the initial sera.
authors.affiliation: Unidad de Investigación, Hospital Clínico Universitario de Valladolid, 47005 Valladolid, Spain.
authors.forename: María Angeles
authors.initials: MA
authors.lastname: Mantecón
authors.forename: Purificación
authors.initials: P
authors.lastname: Gutiérrez
authors.forename: María
authors.initials: M
authors.lastname: del Pilar Zarzosa
authors.forename: Ana I
authors.initials: AI
authors.lastname: Dueñas
authors.forename: Javier
authors.initials: J
authors.lastname: Solera
authors.forename: Luis
authors.initials: L
authors.lastname: Fernández-Lago
authors.forename: Nieves
authors.initials: N
authors.lastname: Vizcaíno
authors.forename: Ana
authors.initials: A
authors.lastname: Almaraz
authors.forename: Miguel Angel
authors.initials: MA
authors.lastname: Bratos
authors.forename: Antonio
authors.initials: A
authors.lastname: Rodríguez Torres
authors.forename: Antonio
authors.initials: A
authors.lastname: Orduña-Domingo
mesh_terms: D000208:Acute Disease; D000372:Agglutination Tests / Q000379:methods*; D000907:Antibodies, Bacterial / Q000097:blood*; D000942:Antigens, Bacterial / Q000032:analysis; D001426:Bacterial Proteins / Q000276:immunology*; D017347:Brucella melitensis / Q000276:immunology*; D002006:Brucellosis / Q000175:diagnosis* / Q000276:immunology; D003600:Cytosol / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D005500:Follow-Up Studies; D006801:Humans; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001426:Bacterial Proteins