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A Study to Evaluate Safety and Effectiveness of mRNA-1273 COVID-19 Vaccine in Healthy Children Between 6 Months of Age and Less Than 12 Years of Age

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ClinicalTrials.gov Identifier: NCT04796896
Recruitment Status : Completed
First Posted : March 15, 2021
Last Update Posted : April 2, 2024
Sponsor:
Information provided by (Responsible Party):
ModernaTX, Inc.

Study Description
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Brief Summary:
The primary goal for this study is to evaluate up to 3 dose levels of mRNA-1273 vaccine given to healthy children as intramuscular (IM) injection in 2 doses (in Parts 1 and 2) and 3 doses (in Part 3), and a third dose or an optional booster dose (BD) (in Parts 1 and 2).

Condition or disease Intervention/treatment Phase
SARS-CoV-2 Biological: mRNA-1273 Biological: Placebo Biological: mRNA-1273.214 Phase 2 Phase 3

Detailed Description:

This is a Phase 2/3, 3-part, open-label, dose-escalation, age de-escalation, randomized, observer-blind, placebo-controlled, expansion study intended to infer the effectiveness of mRNA-1273 in children aged 6 months to less than 12 years.

Please access http://www.kidcovestudy.com for additional information, such as Study Overview, Participation, Site Locations along with contact numbers for each location for the study.

Study Design
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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 11950 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Masking Description: Parts 1 and 3 are Open-label; Part 2 Randomized and Observer-blind
Primary Purpose: Prevention
Official Title: A Phase 2/3, Three-Part, Open-Label, Dose-Escalation, Age De-escalation and Randomized, Observer-Blind, Placebo-Controlled Expansion Study to Evaluate the Safety, Tolerability, Reactogenicity, and Effectiveness of mRNA-1273 SARS-CoV-2 Vaccine in Healthy Children 6 Months to Less Than 12 Years of Age
Actual Study Start Date : March 15, 2021
Actual Primary Completion Date : March 15, 2024
Actual Study Completion Date : March 15, 2024

Resource links provided by the National Library of Medicine


Arms and Interventions
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Arm Intervention/treatment
Experimental: mRNA-1273

Part 1: Participants will receive 2 IM injections of mRNA-1273 at doses pre-specified for this study, on Days 1 and 29. Participants will be offered an optional BD of mRNA-1273 lower than the dose chosen for primary series, ≥6 months after Dose 2. After protocol amendment (PA) 9, participants who have not yet received a BD will be offered a BD with mRNA-1273.214.

Part 2: Participants will receive 2 IM injections of mRNA-1273 at dose selected from Part 1 on Days 1 and 29. Participants (6 to <12 year) will be offered an optional BD of mRNA-1273 lower than the dose chosen for primary series, ≥6 months after Dose 2. After PA 9, participants who have not yet received a BD will be offered a BD with mRNA-1273.214.

Part 3: Participants will receive 2 IM injections of mRNA-1273 on Days 1 and 29 as primary series then 1 IM injection as Dose 3, on Day 149 ≥3 months and ≤5 months after receipt of Dose 2 of primary series. All 3 injections will be administered at lower dose than that of Part 1.

 Biological: mRNA-1273
Sterile liquid for injection

Biological: mRNA-1273.214
Sterile liquid for injection
Placebo Comparator: Placebo
Part 2 only: Participants will receive 2 IM injections of mRNA-1273-matching placebo on Day 1 and Day 29. Participants (6 to <12 year old) will be offered an optional BD of mRNA-1273 at a dose lower than the dose that was chosen for the primary series for this age group, at least 6 months post-cross-over Dose 2. After PA 9, participants who have not yet received a BD will be offered a BD with mRNA-1273.214.
 Biological: mRNA-1273
Sterile liquid for injection

Biological: Placebo
0.9% sodium chloride (normal saline) injection

Biological: mRNA-1273.214
Sterile liquid for injection


Outcome Measures
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Primary Outcome Measures :
  1. Number of Participants with Solicited Local and Systemic Adverse Reactions (ARs) [ Time Frame: Up to Day 156 (7 days after each injection) ]
  2. Number of Participants with Unsolicited Adverse Events (AEs) [ Time Frame: Up to Day 177 (28 days after each injection) ]
  3. Number of Participants with Medically-Attended AEs (MAAEs) [ Time Frame: Up to Day 514 (1 year after booster dose) ]
  4. Number of Participants with Serious Adverse Events (SAEs) [ Time Frame: Up to Day 514 (1 year after booster dose) ]
  5. Number of Participants with Adverse Events of Special Interest (AESIs), Including Multisystem Inflammatory Syndrome in Children (MIS-C), Myocarditis and/or Pericarditis [ Time Frame: Up to Day 514 (1 year after booster dose) ]
  6. Number of Participants with AEs Leading to Discontinuation From Study Post-Booster Dose Through the Last Day of Study Participation [ Time Frame: Day 149 (booster dose Day 1) through the last day of study participation (Day 514) ]
  7. Number of Participants with Serum Antibody Levels that Meet or Exceed the Threshold of Protection From COVID-19 [ Time Frame: Day 57 (1 month after second injection) ]
    Threshold of protection as predefined for study.

  8. Geometric Mean (GM) Value of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Specific Serum Antibody [ Time Frame: Day 57 (1 month after second injection) ]
  9. Seroresponse Rate of Vaccine Recipients [ Time Frame: Day 57 (1 month after second injection) ]
  10. GM Value of Post-Booster Dose SARS-CoV-2 Specific Serum Antibody [ Time Frame: Day 149 (post third dose) ]
  11. Seroresponse Rate of Post-Booster Dose of Vaccine Recipients [ Time Frame: Day 149 (post third dose) ]

Secondary Outcome Measures :
  1. GM Value of SARS-CoV-2 S-Protein-Specific Binding Antibody (bAb) [ Time Frame: Day 1, Day 57, Day 209, Day 394, booster dose Day 1, booster dose Day 29, booster dose Day 181, and booster dose Day 366 ]
  2. GM Value of SARS-CoV-2- Specific Neutralizing Antibody (nAb) [ Time Frame: Day 1, Day 57, Day 209, Day 394, booster dose Day 1, booster dose Day 29, booster dose Day 181, and booster dose Day 366 ]
  3. Number of Participants with SARS-CoV-2 Infections Regardless of Symptomatology, as Assessed by Serology and/or Reverse Transcriptase Polymerase Chain Reaction (RT-PCR) [ Time Frame: Up to Day 394 ]
    Clinical signs indicative of SARS-CoV-2 infection as predefined for the study.

  4. Number of Participants with SARS-CoV-2 Infection Measured by RT-PCR and/or bAb Levels Against SARS-CoV-2 Nucleocapsid Protein in Participants with Negative SARS-CoV-2 at Baseline, in the Absence of Any COVID-19 Symptoms [ Time Frame: Up to Day 394 ]
  5. Number of Participants with a First Occurrence of COVID-19 [ Time Frame: Up to Day 394 ]
    Clinical signs indicative of COVID-19 as predefined for the study.


Eligibility Criteria
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Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.


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Ages Eligible for Study:   6 Months to 11 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Key Inclusion Criteria:

  • For participants with chronic diseases (such as, asthma, diabetes mellitus, cystic fibrosis, human immunodeficiency virus [HIV] infection), the disease should be stable, per investigator assessment.
  • Investigator assessment that the parent(s)/legally acceptable representatives understand and are willing and physically able to comply with protocol mandated follow-up, including all procedures, written informed consent is provided, and participants provide assent.
  • For children 2 years of age or older has a body mass index at or above the third percentile according to World Health Organization (WHO) Child Growth Standards at the Screening Visit.
  • For children 6 months to <12 months of age: born at full-term with a minimum birth weight of 2.5 kilograms (kg).
  • For female participants of childbearing potential: negative pregnancy test, adequate contraception or has abstained from all activities that could result in pregnancy for at least 28 days prior to the first injection, agreement to continue adequate contraception or abstinence through 3 months following the second injection (Day 29) and the third dose in Part 3 (Day 149/booster dose Day 1), and not currently breastfeeding.

Key Exclusion Criteria:

  • Known history of SARS-CoV-2 infection within 2 weeks prior to administration of vaccine or known close contact with anyone with laboratory-confirmed SARS-CoV-2 infection or COVID-19 within 2 weeks prior to administration of vaccine.
  • Prior administration of an investigational or approved CoV (such as, SARS-CoV-2, SARS CoV, Middle East Respiratory Syndrome CoV) vaccine.
  • Treatment with investigational or approved agents for prophylaxis against COVID 19 (such as, receipt of SARS-CoV-2 monoclonal antibodies) within 6 months prior to enrollment.
  • Known hypersensitivity to a component of the vaccine or its excipients.
  • A medical or psychiatric condition that, according to the investigator's judgment, may pose additional risk as a result of participation, interfere with safety assessments, or interfere with interpretation of results.
  • History of a diagnosis or condition that, in the judgment of the investigator, may affect study endpoint assessment or compromise participant safety.
  • Received any non-study vaccine within 14 days before or after any dose of vaccine (except for seasonal influenza vaccine, which is not permitted within 14 days before or after any dose of vaccine)
  • Received intravenous or subcutaneous blood products (red blood cells, platelets, immunoglobulins) within 3 months prior to Day 1
  • Participated in an interventional clinical study within 28 days prior to Day 0 or plans to donate blood products while participating in this study.
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04796896


Locations
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Sponsors and Collaborators
ModernaTX, Inc.
More Information
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Additional Information:

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

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Responsible Party: ModernaTX, Inc.
ClinicalTrials.gov Identifier: NCT04796896    
Other Study ID Numbers: mRNA-1273-P204
First Posted: March 15, 2021    Key Record Dates
Last Update Posted: April 2, 2024
Last Verified: March 2024

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by ModernaTX, Inc.:
mRNA-1273
mRNA-1273 vaccine
SARS-CoV-2
SARS-CoV-2 Vaccine
Coronavirus
 Virus Diseases
Messenger RNA
COVID-19
COVID-19 Vaccine
Moderna