- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05579821
Evaluation Study of DPP® Typhoid Assay
Evaluation of DPP® Typhoid Assay (Chembio Diagnostic System, Inc) for the Diagnosis of Typhoid From Well Characterized Serum Sample.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Typhoid is an acute febrile illness caused by Salmonella enterica serovar Typhi (S. Typhi). Annually, an estimated 11-21 million people become infected with typhoid fever and 128000-161000 people die from the disease . It is commonly transmitted through consumption of contaminated food or water. Low and middle-income countries and areas with poor access to safe water, food and sanitation are at higher risk of infection.
Blood and bone marrow culture is considered as the mainstay for laboratory confirmation of typhoid. However, it is expensive, requires specific laboratory equipment and technical expertise and takes longer time to generate results. Several RDTs and Widal test are available which do not require specialized laboratory and well-trained staff but lack sensitivity and specificity. Several studies have been done for identification of promising antigens that can be used to develop an accurate serodiagnostic assay. S. Typhi lipopolysaccharide (LPS) and hemolysin E (HlyE) have been identified as top candidate antigens by several studies to differentiate acute typhoid patients from healthy individuals. HlyE is a pore-forming toxin that affects bacterial growth within human macrophages and contributes to the cytotoxicity and invasion of epithelial cells.
Dual Path Platform (DPP) Typhoid Assay of Chembio is a point-of-care (POC) immunochromatographic technology which has the capability of measuring IgA response in blood, plasma and serum to both LPS and HlyE. A previous study done on this POC showed promising sensitivity and specificity to diagnose typhoid.Thus, the current study aims to assess the sensitivity and specificity of DPP ® Typhoid Assay using blood culture as the reference point.
Study Type
Enrollment (Actual)
Contacts and Locations
Study Contact
- Name: Jyotshna Sapkota, MD
- Phone Number: 977-9851182704
- Email: Jyotshna.Sapkota@finddx.org
Study Locations
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Karachi, Pakistan
- Aga Khan University
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Sampling Method
Study Population
The study will be conducted at AKU research laboratory using well characterized typhoid positive and typhoid negative serum samples, which were archived for further research purposes from previous trial "Comparative study of commercially available typhoid point of care tests to benchmark current and emerging tools" conducted at AKU in 2020-2021. Precisely, the population is represented by children and adults (age 2-65) who presented with fever of 3-7 days duration.
All patients from whom these samples were obtained have consented to store their sample at AKU and to use them for research on diagnostic tool for fever management.
Prospective approval of protocol deviations to recruitment and enrolment criteria, also known as protocol waivers or exemptions, is not permitted.
Description
Inclusion Criteria:
- Inclusion criteria identical to the prior prospective study in AKU (Protocol ref number: FE006)
- Serum stored frozen at AKU as a part of afore mentioned study and cold-chain maintained.
Exclusion Criteria:
- Samples whose reference standard data (Blood culture report) are not available in FIND's OpenClinica database.
Study Plan
How is the study designed?
Design Details
- Observational Models: Cohort
- Time Perspectives: Retrospective
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
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Point estimates of sensitivity and specificity with 95% confidence interval of DPP Typhoid assay using blood culture as reference standard
Time Frame: October 2022
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October 2022
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Secondary Outcome Measures
Outcome Measure |
Time Frame |
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Estimates of operational characteristics of DPP Typhoid Assay, based on quantitative assessment including invalid rates
Time Frame: Nov 2022
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Nov 2022
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Collaborators and Investigators
Collaborators
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Estimated)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- FE006C
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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