Testing of a New Rapid Antigen Test for Plague in Ituri, Democratic Republic of the Congo.

NCT ID: NCT07174648

Last Updated: 2025-09-19

Basic Information

• Recruitment Status: NOT_YET_RECRUITING
• Total Enrollment: 300 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2026-01-02
• Study Completion Date: 2029-01-02

Brief Summary

This study is being done to learn more about the disease in Ituri and to evaluate a new rapid test that may help doctors find the disease more quickly. This research includes characterisation of clinical presentations and pathology of plague, as well as identification of circumstances that may increase the risk of infection. Biological samples collected include blood, mouth swab, saliva, a bubo aspirate and a sputum sample (the latter only in case of plague in the lungs). These samples will be used to test the performance of the new rapid study test.

Detailed Description

Plague is a life-threatening infection caused by the bacterium Yersinia pestis, which is highly endemic in the Ituri Province of the Democratic Republic of Congo (DRC) and associated with recurrent risks of regional epidemic spread. Clinical presentations (bubonic and/or pulmonary) and outcome remain poorly characterised in this area, and diagnostic accuracy is limited due to absence of a local bacteriology laboratory.

A novel lateral-flow immunochromatographic duplex rapid diagnostic test (RDT) has been developed for plague, which detects both F1 and LcrV proteins, and appears superior to the current RDT detecting only F1 antigens. This index RDT (called Duplex F1V) has shown promise in detecting Yersinia pestis in various sample types, including blood, bubo aspirates, and saliva in human patients.

Cross-sectional diagnostic accuracy study in clinical suspects of plague, comparing the results of Duplex F1V RDT (index assay), with PCR (polymerase chain reaction) positivity (as reference assay) on different biological fluids and assessment of clinical outcome at the end of treatment (at day 10-14).

Nested test-negative case-control study to identify risk factors and clinical predictors in PCR-confirmed plague cases, compared to PCR-negative suspects.

The study will take place in the Ituri province of DRC, the world's largest plague focus. Participants will be recruited in health centers and reference hospitals in the health areas of Rethy, Logo and Aru where the teams of the "Centre de Recherche en Maladies Tropicales" (CRMT) of Ituri are active. Individuals ≥5 years of age presenting at the sites with clinical suspicion of plague -as per national clinical case definitions- will be enrolled after informed consent and followed-up until treatment completion.

Conditions

Plague; Bubonic; Plague, Skin; Plague, Pneumonic

Study Design

• Observational Model Type: OTHER
• Study Time Perspective: PROSPECTIVE

Study Groups

Group 1

Cross-sectional Nested test-negative case-control study

No interventions assigned to this group

Eligibility Criteria

Inclusion Criteria

• All participants (aged ≥5 year old) within Rethy, Logo and Aru health zones, presenting with possible symptoms of bubonic and/or pneumonic plague according to WHO definition
• Willing to provide voluntary consent (or voluntary assent and parental consent in case of minors.

Exclusion Criteria

• Participants not eligible, able, or willing to undergo study procedures
• Children <5 years of age
• Participants on antibiotic treatment ≥48h prior to recruitment

• Minimum Eligible Age: 5 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

ANRS | Maladies infectieuses émergentes

UNKNOWN

Sponsor Role: collaborator

Institut Pasteur

INDUSTRY

Sponsor Role: collaborator

Université Paris-Saclay

OTHER

Sponsor Role: collaborator

Centre de Recherche en Maladies Tropicales de L'Ituri (CRMT)

UNKNOWN

Sponsor Role: collaborator

Institut National pour la Recherche Biomedicale (INRB)

UNKNOWN

Sponsor Role: collaborator

Institute of Tropical Medicine, Belgium

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Other Identifiers

RAPIDIT

Identifier Type: -

Identifier Source: org_study_id