Diagnostic Accuracy of Rk28-Based Immunochromatographic Rapid Diagnostic Tests for Visceral Leishmaniasis: A Prospective Clinical Cohort Study in Sudan

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dc.FacultyEndemic Diseasesen_US
dc.contributor.authorMukhtar, Moawia M.
dc.contributor.authorAbdoun, A
dc.contributor.authorAhmed, AE
dc.contributor.author., etal
dc.contributor.otherMolecular Biologyen_US
dc.date2015
dc.date.accessioned2016-01-27T07:46:27Z
dc.date.available2016-01-27T07:46:27Z
dc.date.issued2016-01-27
dc.date.submitted2016
dc.description.abstractBACKGROUND: Rapid diagnostic tests (RDTs) for visceral leishmaniasis (VL) based on rK39 antigen showed suboptimal sensitivity in East Africa. A prospective clinical cohort study in Sudan was designed to validate a novel rK28-based RDT for Leishmania donovani VL. METHODS: Patients (n=285) suspected of VL by residency, fever for ≥2 weeks, splenomegaly with no prior reported VL, and negative for malaria were consecutively enrolled at three Sudanese sites in 2012-2013 and informed consent obtained. Two human readers, who were blinded to the clinical status and other RDT results, evaluated patient whole blood (WB) and serum on the rK28 RDT. Based on Leishmania parasite detection in lymph node or bone marrow aspirates (Giemsa-stained smears or culture in Novy-MacNeal-Nicolle medium), patients were categorized as VL cases (n=200) or VL controls (n=85). RESULTS: The rK28 RDT had high specificity using either WB (100% [85/85]) or serum (97.6% [83/85]) and exhibited greater sensitivity (WB, 92.5% [185/200]; serum, 94.5% [189/200]) than a direct agglutination test performed with the same sera (92.9% [79/85] and 83.5% [167/200] for specificity and sensitivity, respectively). Two blinded readers scored a given WB or serum sample the same on the rK28 RDT 99.6% and 100% of the time, respectively. A reader scored each individual donor's paired WB and serum rK28 RDT results the same 97.2% of the time. CONCLUSIONS: An inexpensive rK28 RDT that performs robustly with WB or serum will be valuable for diagnosing cases of VL in East Africa.en_US
dc.identifier.urihttp://khartoumspace.uofk.edu/handle/123456789/18644
dc.language.isoenen_US
dc.publisherUOFKen_US
dc.subjectClinical studyen_US
dc.subjectDiagnosisen_US
dc.subjectEast Africaen_US
dc.subjectLeishmania donovanien_US
dc.subjectVisceral leishmaniasisen_US
dc.subjectrK28 RDTen_US
dc.titleDiagnostic Accuracy of Rk28-Based Immunochromatographic Rapid Diagnostic Tests for Visceral Leishmaniasis: A Prospective Clinical Cohort Study in Sudanen_US
dc.typePublicationen_US

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