title: LipL32, an outer membrane protein of Leptospira, as an antigen in a dipstick assay for diagnosis of leptospirosis.
abstract: Microscopic agglutination test (MAT), as well as other serological assays that aimed at detecting antibodies to Leptospira, supplements the leptospirosis diagnosis based on the clinical features. Nevertheless, false positive results have been occasionally reported when the crude antigen was used in those antibody-based tests due either to the presence of antibodies stimulated by other antigenically related pathogens in the patient's serum, or the antibodies in the serum may be stimulated by a previously unrecognized Leptospira infection, especially in the disease endemic areas. Thus, the more refined antigen should improve the serodiagnostic accuracy. Among Leptospira spp., LipL32, which is a pathogenic Leptospira outer membrane protein (OMP), expressed by the bacteria grown both in vitro and in vivo. In this study, recombinant LipL32 protein was tested by a dipstick method for its potential in serodiagnosis of leptospirosis. Preliminary results suggest that the recombinant LipL32 is a good diagnostic detection reagent for specific Leptospira IgG. Diagnostic sensitivity and specificity of the Lip32 dipstick assay, when compared to those of MAT, were 100% and 98.33%, respectively.
authors.affiliation: Inter-Department of Medical Microbiology, Faculty of Graduate School, Chulalongkorn University, Bangkok, Thailand.
authors.forename: Doojdao
authors.initials: D
authors.lastname: Boonyod
authors.forename: Yong
authors.initials: Y
authors.lastname: Poovorawan
authors.forename: Parvapan
authors.initials: P
authors.lastname: Bhattarakosol
authors.forename: Chintana
authors.initials: C
authors.lastname: Chirathaworn
mesh_terms: D000372:Agglutination Tests; D000907:Antibodies, Bacterial / Q000097:blood; D000942:Antigens, Bacterial / Q000097:blood; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology*; D016022:Case-Control Studies; D004269:DNA, Bacterial / Q000302:isolation & purification; D019084:Fluorescent Antibody Technique, Indirect; D016680:Genome, Bacterial; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D007075:Immunoglobulin M / Q000097:blood; D007919:Leptospira / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification*; D007922:Leptospirosis / Q000097:blood / Q000175:diagnosis* / Q000276:immunology; D008074:Lipoproteins / Q000276:immunology*; D011994:Recombinant Proteins / Q000276:immunology; D012680:Sensitivity and Specificity; D017422:Sequence Analysis, DNA
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D004269:DNA, Bacterial; D007074:Immunoglobulin G; D007075:Immunoglobulin M; C406589:LipL32 protein, Leptospira; D008074:Lipoproteins; D011994:Recombinant Proteins