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CompletedNCT05048849Updated Aug 24, 2022

A Study to Evaluate the Safety, Tolerability, and Immunogenicity of COVID-19 Vaccine, CT-COV-21 Extension Study

A Phase 2 interventional study of MVC-COV1901(S protein with adjuvant) in Covid19 Vaccine, sponsored by Medigen Vaccine Biologics Corp.. Completed at 11 sites in Taiwan. Open to participants aged 20 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2022-08-24.

Sponsored by Medigen Vaccine Biologics Corp. · Phase 2, Interventional, and Prevention

Phase
Phase 2
Study type
Interventional
Enrollment
274
Allocation
Not applicable
Ages
20 Years and older
Sex
All
01

Study summary

The purpose of this study is to assess the safety and immunogenicity of MVC-COV1901 vaccine who are generally healthy or with stable pre-existing health conditions and have received 2 doses of Placebo in the main study CT-COV-21

Read the detailed description

This is an extension study of the main study CT-COV-21, "A Phase II, Prospective, Double-blinded, Multi-Center, Multi-Regional Study to Evaluate the Safety, Tolerability, and Immunogenicity of the SARS-CoV-2 Vaccine Candidate MVC-COV1901."

This extension study is a prospective, open-label, multicenter study. In this extension study, approximately 500 participants who received the placebo and have remained blinded in the main study until Day 119 (90 days after the second vaccination of the main study) are enrolled and receive MVC-COV1901. Each participant will receive 2 doses of MVC-COV1901, administered 28 days apart via IM injection in the deltoid region, preferably of the non-dominant arm, at Day 1 and Day 29.

02

Conditions studied

  • Covid19 Vaccine

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Keywords

  • Covid19 vaccine
03

In context

COVID-19

7,640 studies on the registry are indexed under COVID-19; 488 are open to participants now.

This study's enrollment of 274 is above the median of 100 across 4,099 interventional studies indexed under COVID-19.

Browse COVID-19 studies →

Lead sponsor

Medigen Vaccine Biologics Corp. is the lead sponsor of 17 studies on the registry; none are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
20 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  1. Participants who are in the placebo arm of the main study (CT-COV-21), and are unblinded due to urgent condition other than safety events (i.e. on request from participants with high risk of acquiring and transmitting infection) after Day 119, are eligible.
  2. Female participant must:

    1. Be either of non-childbearing potential, i.e. surgically sterilized (defined as having undergone hysterectomy and/or bilateral oophorectomy and/or bilateral salpingectomy; tubal ligation alone is not considered sufficient) or one year post-menopausal;
    2. Or, if of childbearing potential, be abstinent or agree to use medically effective contraception from 14 days before screening to 30 days following the last injection of study intervention. Acceptable forms include:

    i. Implanted hormonal methods of contraception or placement of an intrauterine device or intrauterine system ii. Established use of hormonal methods (injectable, pill, patch or ring) combined with barrier methods of contraception: condom or occlusive cap (diaphragm or cervical/vault caps) with spermicidal foam/gel/film/cream/suppository c. Have a negative pregnancy test

  3. Participant is willing and able to comply with all required study visits and follow-up required by this protocol.
  4. Participant or the participant's legal representative must understand the procedures of the study and provide written informed consent

Exclusion criteria

Exclusion Criteria

  1. Pregnant or breast feeding or have plan to become pregnant in 30 days after last administration of study intervention.
  2. Employees at the investigator's site, of the Sponsor or the contract research organization (CRO) directly involved in the conduct of the study.

    Prior/Concomitant Therapy

  3. Currently receiving or received any investigational intervention within 30 days prior to the first dose of study intervention.
  4. Administered any licensed live-attenuated vaccines within 28 days or other licensed non-live-attenuated vaccines within 7 days prior to the first dose of study intervention.
  5. Administered any blood product or intravenous immunoglobulin administration within 12 weeks prior to the first dose of study intervention.
  6. Currently receiving or anticipate to receive concomitant immunosuppressive or immune-modifying therapy (excluding inhaled, topical skin and/or eye drop-containing corticosteroids, low-dose methotrexate, or \< 2 weeks of daily receipt of prednisone less than 20 mg or equivalent) within 12 weeks prior to the first dose of study intervention.
  7. Currently receiving or anticipate to receive treatment with tumor necrosis factor (TNF)-α inhibitors, e.g. infliximab, adalimumab, etanercept within 12 weeks prior to the first dose of study intervention.
  8. Major surgery or any radiation therapy within 12 weeks prior to the first dose of study intervention
  9. Participant with previous known or potential exposure to SARS-CoV-1 or 2 viruses or received any other COVID-19 vaccine.
  10. Participant with a history of hypersensitivity to any vaccine or a history of allergic disease or reactions likely to be exacerbated by any component of the MVC-COV1901.
  11. Body (oral, rectal, or ear) temperature ≥ 38.0°C or acute illness (not including minor illnesses such as diarrhea or mild upper respiratory tract infection at the discretion of the investigator) within 2 days before the first dose of study intervention.
05

Study design

Phase
Phase 2
Primary purpose
Prevention
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
274 participants (actual)

Study arms

  • Experimental
    MVC-COV1901(S protein with adjuvant)

    S-2P protein with CpG and Aluminum Hydroxide/0.5mL

    Biological: MVC-COV1901(S protein with adjuvant)

Interventions

  • BiologicalMVC-COV1901(S protein with adjuvant)

    Approximately 500 participants will receive 2 doses of MVC-COV1901(S-2P protein with adjuvant) at Day 1 and Day 29 via intramuscular (IM) injection in the deltoid region

06

What researchers measure

Primary outcomes

  1. Number of Adverse Event (Safety of MVC-COV1901)

    To evaluate the safety and tolerability of MVC-COV1901 from Day 1 to 28 days after the second dose of study intervention in terms of the number of participants with the occurrence of: * Solicited local AEs (up to 7 days after each dose of study intervention) * Solicited systemic AEs (up to 7 days after each dose of study intervention) * Unsolicited AEs (up to 28 days after each dose of study intervention) * AE of Special Interest (AESI) * Vaccine-Associated Enhanced Disease(VAED) * Serious adverse events (SAEs)

    Time frame: Day 1 to 28 days after second vaccination

  2. Percentage of Adverse Event (Safety of MVC-COV1901)

    To evaluate the safety and tolerability of MVC-COV1901 from Day 1 to 28 days after the second dose of study intervention in terms of the percentage of participants with the occurrence of: * Solicited local AEs (up to 7 days after each dose of study intervention) * Solicited systemic AEs (up to 7 days after each dose of study intervention) * Unsolicited AEs (up to 28 days after each dose of study intervention) * AE of Special Interest (AESI) * Vaccine-Associated Enhanced Disease(VAED) * Serious adverse events (SAEs)

    Time frame: Day 1 to 28 days after second vaccination

  3. Immunogenicity of MVC-COV1901(Neutralizing Antibody)

    To evaluate the immunogenicity of MVC-COV1901 in terms of neutralizing antibody titers 28 days after the second dose of study intervention

    Time frame: Day 1 to 28 days after second vaccination

Secondary outcomes

  1. Number of Adverse Event over the study period (Secondary Safety of MVC-COV1901)

    To evaluate the safety of MVC-COV1901 over the study period in terms of the number of participants with the occurrence of: * \>= Grade 3 AE * AE of Special Interest (AESI) * Vaccine-Associated Enhanced Disease(VAED) * Serious adverse events (SAEs)

    Time frame: Day 1 to 180 days after second vaccination

  2. Percentage of Adverse Event over the study period (Secondary Safety of MVC-COV1901)

    To evaluate the safety of MVC-COV1901 over the study period in terms of the percentage of participants with the occurrence of: * \>= Grade 3 AE * AE of Special Interest (AESI) * Vaccine-Associated Enhanced Disease(VAED) * Serious adverse events (SAEs)

    Time frame: Day 1 to 180 days after second vaccination

  3. Immunogenicity of MVC-COV1901(Antigen-specific Immunoglobulin)

    To evaluate the immunogenicity of MVC-COV1901 in terms of antigen-specific immunoglobulin 28 days after the second dose of study intervention

    Time frame: Day 1 to 28 days after second vaccination

Other outcomes

  1. Incidence of confirmed COVID-19 cases (Efficacy of MVC-COV1901)

    To estimate the efficacy of MVC-COV1901, as compared to placebo, in the prevention of COVID-19 in terms of : * The number of laboratory-confirmed COVID-19 cases occurring ≥ 15 days after any dose of study intervention. * The number of laboratory-confirmed COVID-19 severe cases occurring ≥ 15 days after any dose of study intervention.

    Time frame: Day 1 to 180 days after second vaccination

07

Study locations

11 sites
  • Changhua Christian Hospital
    Changhua, Taiwan
  • Kaohsiung Medical University Chung-Ho Memorial Hospital
    Kaohsiung, Taiwan
  • China Medical University Hospital
    Taichung, Taiwan
  • National Cheng Kung University Hospital
    Tainan, Taiwan
  • National Taiwan University Hospital
    Taipei, Taiwan
  • Taipei Medical University Hospital
    Taipei, Taiwan
  • Taipei Municipal Wan Fang Hospital
    Taipei, Taiwan
  • Taipei Veteran General Hospital
    Taipei, Taiwan
  • Tri-Service General Hospital
    Taipei, Taiwan
  • Chang-Guang Memorial Hospital Lin-Kou
    Taoyuan, Taiwan
  • Tao-Yuan General Hospital
    Taoyuan, Taiwan
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Aug 24, 2022, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT05048849
Lead sponsor
Medigen Vaccine Biologics Corp.
Responsible party
Sponsor
First posted
Sep 17, 2021
Start date
Jul 19, 2021
Primary completion
Nov 8, 2021
Completion
Apr 12, 2022
Last update
Aug 24, 2022

Study contacts

Szu-Min Hsieh, MD
principal investigator · National Taiwan University Hospital
Tzou-Yien Lin, MD
principal investigator · Chang Gang Memorial Hospital, LinKou

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Sep 2021. You cannot join it, but the record below documents what was studied.

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