- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT06118749
Leishmania Antigen Rapid Diagnostic Test Proof-of-Concept and Validation Study
Visceral leishmaniasis (VL) or kala azar is a neglected tropical disease(NTD) caused by protozoan parasites of the Leishmania donovani complex that are transmitted by phlebotomine sand flies. An estimated 50,000 - 90,000 new cases occur worldwide annually. It is characterized by fever, weight loss, enlargement of the spleen and liver, and anaemia, and it can be fatal in more than 95% of cases without treatment. The Horn of Africa accounts for the largest number of VL cases worldwide, and communities living in remote, resource-limited settings are at greatest risk of infection. Therefore, early and accurate diagnosis of VL in health facilities is essential. VL is fatal if it is not adequately treated. The drugs currently used to treat VL can have severe side effects and the clinical presentation of VL is not sufficiently specific to guide treatment. Highly accurate (both sensitive and specific), cheap and simple rapid diagnostic tests (RDTs) are therefore crucial for case-management of VL. Early case detection followed by adequate treatment is also central to control of VL.
In Kenya, Visceral leishmaniasis is diagnosed by the rK39 RDT based on detection of host antibody to a 39-aminoacid-repeat recombinant leishmanial antigen in clinically suspected cases. Because this test has a suboptimal sensitivity of around 85%, other additional diagnostic tests are often necessary. These include the direct agglutination test (DAT) based on agglutination of whole parasite antigen by parasite specific host antibodies and microscopy detection of amastigotes in stained smears from lymph node punctures, bone marrow or spleen aspirates currently the gold standard for confirmatory diagnosis.
While the use of rK39 RDT and DAT has been on the increase, the tests cannot distinguish active from past infections as they are based on detection of antileishmania antibodies which are present in both active and past infections. Furthermore, DAT requires some laboratory skills and overnight incubations before obtaining the results and the rK39 has low sensitivity when used in Eastern Africa. There have therefore been efforts to develop an antigen detection based test that is based on minimally invasive specimen collection such as blood or urine.
To this end, a collaboration between KEMRI, DNDi, FIND and the University of York under the Next generation diagnostics and oral treatment for visceral leishmaniasis in Eastern Africa: transforming patient care through innovation (VL-INNO) EDCTP project, aims to develop an antigen based diagnostic test based on parasite biomarkers in urine and blood from VL patients. In this project, a proteomics approach will be used to identify candidate Leishmania antigens that are found in the blood and urine of confirmed visceral leishmaniasis. The University of York will undertake proteomics analyses of the specimens using highly sensitive Liquid Chromatograph Triple Quadrupole Mass Spectrometer (LCMS/MS) to explore antigen diversity in defined archived clinical samples (blood, urine) from VL patients before and after treatment. Based on yield, stability and immunogenicity of the antigens, monoclonal antibodies (mAb) will be production for subsequent development of a lateral flow rapid diagnostic test(RDT) prototype that can detect leishmania antigens in blood and/or urine of VL patients.
With these activities initiated using samples previously collected from VL patients in Kenya, this current protocol seeks to collect samples (blood and urine) from two VL treatment centres namely Chemolingot Sub-county hospital in Baringo County and Kacheliba Sub-county, West Pokot, to be used in the evaluation of the RDT prototype. We will analyze samples from VL patients collected before and at the end of treatment, to determine the sensitivity of the test and how parasite antigen abundance in urine and blood changes as a consequence of clinical cure. Samples from healthy endemic controls will be used to determine the specificity of the test.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Estimated)
Contacts and Locations
Study Contact
- Name: Dawn Maranga
- Phone Number: +254722554641
- Email: Dawn.Maranga@finddx.org
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Child
- Adult
- Older Adult
Accepts Healthy Volunteers
Sampling Method
Study Population
Description
Inclusion Criteria:
Participants are eligible to be included in the study only if ALL of the following criteria are met:
- Patient with a confirmed diagnosis of VL based on the VL diagnostic algorithm as in the national guidelines, either before treatment or after treatment completion OR healthy individuals with no clinical signs compatible with VL.
- Participant ≥ 4 years old.
- Participant from whom written informed consent can be obtained or signed by parent or legal guardian if patient is under 18 years of age. In the case of minors, assent from the children (13-17 years old) will be obtained.
- Clinical samples required for the study (peripheral blood and urine) can be obtained.
Exclusion Criteria:
Participants cannot be included in the study if ANY of the following criteria apply:
- Patients < 4 years old.
- Patients from which, for any reason, none of the sample needed (urine or blood) can be taken.
Study Plan
How is the study designed?
Design Details
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Diagnostic accuracy
Time Frame: 18 months
|
The diagnostic accuracy of newly developed RDT will be evaluated to give specificity, sensitivity values
|
18 months
|
Collaborators and Investigators
Collaborators
Study record dates
Study Major Dates
Study Start (Estimated)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- NT015
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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