A Study of CP-COV03 Compared With Placebo in Participants With Dengue (Part 1) and Dengue-like Illness (Part 2)

May 4, 2026 updated by: Hyundai Bioscience Co., Ltd.

A Randomized, Double-blinded, Placebo-controlled Clinical Trial to Evaluate Safety and Efficacy of CP-COV03 in Dengue Patients (Part 1) / Dengue and Dengue-like Illness Patients (Part 2)

This is a randomized, double-blind, placebo-controlled Phase 2/3 study to evaluate the efficacy, safety, and antiviral activity of CP-COV03 in adult patients with dengue infection.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

In Phase 2, approximately 210 patients with NS1-positive dengue within 72 hours of fever onset will be randomized to receive placebo or CP-COV03 at doses of 450, 900, or 1,350 mg/day for 7 days. An interim analysis by an independent Data and Safety Monitoring Board (DSMB) will support dose selection for Phase 3.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
210

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Vietnam
      • Hanoi, Vietnam
        • Not yet recruiting
        • The National Hospital of Tropical Diseases (NHTD)
      • Mỹ Tho, Vietnam
        • Recruiting
        • Tien Giang Provincial General Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Patients who are 18 years or over of age at time of screening.
  • Patients who have at least two symptoms with a score of 2 or higher within 72 h from fever onset.
  • Patients who are diagnosed with dengue by NS1 positive (Phase 2- Part 1 only). And patients who are classified as dengue, zika, influenza, COVID-19 and others (Phase 3- Part 2 only)

Exclusion Criteria:

  • Patients who show severe dengue (WHO dengue guideline C, any severe symptoms or clinical laboratory results)
  • Patients who have previously received dengue vaccine
  • Patients who have chronic medical conditions such as uncontrolled diabetes mellitus, severe asthma requiring oral steroids or admission to the hospital in the previous 6 months for cardiac disease

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Placebo Comparator: Placebo
Matching placebo
Drug: Placebo
Oral administration
Experimental: CP-COV03 low dose
450 mg/day
Drug: CP-COV03
Oral administration
Experimental: CP-COV03 mid dose
900 mg/day
Drug: CP-COV03
Oral administration
Experimental: CP-COV03 high dose
1,350 mg/day
Drug: CP-COV03
Oral administration

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
[Part 1] Incidence and severity of Adverse Events (AEs) and Serious Adverse Events (SAEs)
Time Frame: From start of study intervention (Day 1) up to end of safety follow-up (Day 29)
The incidence and severity of AEs / SAEs will be summarized by treatment group. Clinical laboratory abnormalities, vital sign changes, and electrocardiogram (ECG) findings will be reported as AEs if they are considered clinically significant.
From start of study intervention (Day 1) up to end of safety follow-up (Day 29)
[Part 1] Average of dengue viral load on Day 3
Time Frame: Baseline, Day 1, 2, 3
The area under the log-transformed DENV RNA viral load (log10 VL) curve from baseline until Day 3 will be determined. The viral load is measured in plasma samples using reverse transcription polymerase chain reaction (RT-PCR).
Baseline, Day 1, 2, 3
[Part 2] Time to sustained symptom improvement up to Day 15
Time Frame: From baseline up to Day 15
Sustained improvement of each targeted symptom is defined as the event occurring on the first 2 consecutive days when each symptom scored as moderate or severe at the time of enrollment is scored as mild or absent, and those scored mild or absent at the time of enrollment are scored as absent.
From baseline up to Day 15

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
[Part 1, 2] Dengue viral load up to Day 6, 8, 15
Time Frame: Baseline, Day 1, 2, 3, 6, 8, 15
The viral load is measured in plasma samples using reverse transcription polymerase chain reaction (RT-PCR).
Baseline, Day 1, 2, 3, 6, 8, 15
[Part 1] Time to sustained symptom improvement up to Day 15
Time Frame: From baseline up to Day 15
Sustained improvement of each targeted symptom is defined as the event occurring on the first 2 consecutive days when each symptom scored as moderate or severe at the time of enrollment is scored as mild or absent, and those scored mild or absent at the time of enrollment are scored as absent.
From baseline up to Day 15
[Part 1, 2] Diagnosis of severe dengue fever or dengue hemorrhagic fever (DHF)
Time Frame: From baseline up to Day 15
Assessment of the clinical course of dengue fever
From baseline up to Day 15
[Part 1] PK parameter - Area under the plasma concentration-time curve (AUC)
Time Frame: Day 1, Day 7
Pharmacokinetic assessment of CP-COV03 in dengue fever patients
Day 1, Day 7
[Part 1] PK parameter - Maximum observed plasma concentration (Cmax)
Time Frame: Day 1, Day 7
Pharmacokinetic assessment of CP-COV03 in dengue fever patients
Day 1, Day 7
[Part 1] PK parameter - Time to reach maximum plasma concentration (Tmax)
Time Frame: Day 1, Day 7
Pharmacokinetic assessment of CP-COV03 in dengue fever patients
Day 1, Day 7
[Part 1] PK parameter - Terminal elimination half-life (t½)
Time Frame: Day 1, Day 7
Pharmacokinetic assessment of CP-COV03 in dengue fever patients
Day 1, Day 7

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Hyundai Bioscience Co., Ltd.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
April 9, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
January 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
May 1, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
April 27, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 4, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 8, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
May 8, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 4, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • DEN-201

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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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