title: An rK28-Based Immunoenzymatic Assay for the Diagnosis of Canine Visceral Leishmaniasis in Latin America.
abstract: Direct observation of Leishmania parasites in tissue aspirates has shown low sensitivity for the detection of canine visceral leishmaniasis (VL). Therefore in the last quarter century immunoenzymatic tests have been developed to improve diagnosis. The purpose of this study was to develop a fast recombinant K28 antigen, naked-eye qualitative enzyme-linked immunosorbent assay (VL Ql-ELISA) and a quantitative version (VL Qt-ELISA), and to display it in a kit format, whose cutoff value (0.156) was selected as the most adequate one to differentiate reactive from nonreactive samples. Considering 167 cases and 300 controls, sensitivity was 91% for both assays and specificity was 100% and 98.7% in Ql-ELISA and Qt-ELISA, respectively. Positive predictive values were 100% and 97.4% for Ql-ELISA and Qt-ELISA, respectively, and negative predictive values were 95.2% for both ELISAs. Reagent stability, reliability studies, including periodic repetitions and retest of samples, cutoff selection, and comparison of rK28 ELISAs with rK39 immunochromatographic test, were the international criteria that supported the quality in both kits. The performance of both ELISA kits in this work confirmed their validity and emphasized their usefulness for low-to-medium complexity laboratories.
authors.affiliation: Instituto Nacional, de Parasitología "Dr. Mario Fatala Chaben," ANLIS, Buenos Aires, Argentina. mlauri_2000@yahoo.es.
authors.forename: Marta Alicia
authors.initials: MA
authors.lastname: Lauricella
authors.affiliation: Instituto Nacional, de Parasitología "Dr. Mario Fatala Chaben," ANLIS, Buenos Aires, Argentina.
authors.forename: Cristina Graciela
authors.initials: CG
authors.lastname: Maidana
authors.affiliation: Instituto Nacional, de Parasitología "Dr. Mario Fatala Chaben," ANLIS, Buenos Aires, Argentina.
authors.forename: Victoria Fragueiro
authors.initials: VF
authors.lastname: Frias
authors.affiliation: Secretaría de Calidad de Vida, Municipalidad de Posadas, Misiones, Argentina.
authors.forename: Carlo M
authors.initials: CM
authors.lastname: Romagosa
authors.affiliation: Instituto Nacional, de Parasitología "Dr. Mario Fatala Chaben," ANLIS, Buenos Aires, Argentina.
authors.forename: Vanesa
authors.initials: V
authors.lastname: Negri
authors.affiliation: Instituto Nacional, de Parasitología "Dr. Mario Fatala Chaben," ANLIS, Buenos Aires, Argentina.
authors.forename: Ruben
authors.initials: R
authors.lastname: Benedetti
authors.affiliation: Instituto Nacional, de Parasitología "Dr. Mario Fatala Chaben," ANLIS, Buenos Aires, Argentina.
authors.forename: Angel J
authors.initials: AJ
authors.lastname: Sinagra
authors.affiliation: Instituto Nacional, de Parasitología "Dr. Mario Fatala Chaben," ANLIS, Buenos Aires, Argentina.
authors.forename: Concepcion
authors.initials: C
authors.lastname: Luna
authors.affiliation: Secretaría de Calidad de Vida, Municipalidad de Posadas, Misiones, Argentina.
authors.forename: Lilian
authors.initials: L
authors.lastname: Tartaglino
authors.affiliation: Instituto Nacional, de Parasitología "Dr. Mario Fatala Chaben," ANLIS, Buenos Aires, Argentina.
authors.forename: Susana
authors.initials: S
authors.lastname: Laucella
authors.affiliation: Infectious Disease Research Institute, Seattle, Washington.
authors.forename: Steven G
authors.initials: SG
authors.lastname: Reed
authors.affiliation: Instituto Nacional, de Parasitología "Dr. Mario Fatala Chaben," ANLIS, Buenos Aires, Argentina.
authors.forename: Adelina R
authors.initials: AR
authors.lastname: Riarte
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood; D000953:Antigens, Protozoan / Q000097:blood; D016022:Case-Control Studies; D004283:Dog Diseases / Q000175:diagnosis* / Q000469:parasitology; D004285:Dogs / Q000469:parasitology; D007124:Immunoenzyme Techniques; D007843:Latin America; D007891:Leishmania / Q000302:isolation & purification; D007898:Leishmaniasis, Visceral / Q000175:diagnosis* / Q000662:veterinary*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014349:Trypanosoma cruzi / Q000302:isolation & purification
chemical_list: D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan