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A Study of an Epstein-Barr Virus (EBV) Candidate Vaccine, mRNA-1189, in 10- to 30-Year-Old Healthy Adolescents and Adults

A Phase 1/2, Randomized, Observer-Blind, Placebo-Controlled, Dose-Ranging Study of an Epstein-Barr Virus (EBV) Candidate Vaccine, mRNA-1189, in 10- to 30-Year-Old Healthy Adolescents and Adults

Status
Active, not recruiting
Phases
Phase 1Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT05164094
Enrollment
867
Registered
2021-12-20
Start date
2021-12-28
Completion date
2027-08-18
Last updated
2026-05-06

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Epstein-Barr Virus Infection

Keywords

Infectious mononucleosis, Mononucleosis

Brief summary

The main objective of Part A of this trial is to evaluate the safety and reactogenicity of mRNA-1189 in 18- to 30-year-old healthy adults, the main objective of Part B is to evaluate the safety and reactogenicity of mRNA-1189 in 12- to \<18-year-old healthy EBV-seronegative adolescents, and the main objective of Part C is to evaluate the safety and reactogenicity of mRNA-1189 in 10- to 21-year-old healthy adolescents and adults.

Interventions

BIOLOGICALmRNA-1189

Sterile liquid for injection

BIOLOGICALPlacebo

0.9% sodium chloride (normal saline) injection

Sponsors

ModernaTX, Inc.
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender
ALL
Age
10 Years to 30 Years
Healthy volunteers
Yes

Inclusion criteria

* According to the assessment of the investigator, is in good general health and can comply with study procedures. Part A: Healthy adult from 18 to 30 years of age (inclusive) at the time of consent (Screening Visit, Day 0). Part B: Healthy baseline EBV-seronegative adolescents from 12 to \<18 years of age at the time of consent (Screening Visit, Day 0). Part C: Healthy adolescents and adults from 10 to 21 years of age (inclusive) at the time of consent (Screening Visit, Day 0).

Exclusion criteria

* Has had significant exposure to someone with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection or COVID-19 in the past 14 days prior to the screening visit, if the participant has not been fully vaccinated against COVID-19 at least 14 days prior to the screening visit. * Has symptomatic acute or chronic illness requiring ongoing medical or surgical care, to include changes in medication in the past 2 months indicating that chronic illness/disease is not stable (at the discretion of the investigator). * Significant, progressive, unstable or uncontrolled clinical condition, including any condition that may affect participant safety, assessment of study endpoints, assessment of immune response, or adherence to study procedures per investigator judgement. * Has a history of myocarditis, and/or pericarditis. * Has received or plans to receive any licensed or authorized vaccine, to include COVID-19 vaccines, ≤28 days prior to the first injection (Day 1) or plans to receive a licensed vaccine within 28 days before or after any study vaccine injection, with the exception of licensed influenza vaccines, which may be received more than 14 days before or after any study vaccine injection. Note: Other inclusion and

Design outcomes

Primary

MeasureTime frame
Number of Participants with Solicited Local and Systemic Reactogenicity Adverse Reactions (ARs)Up to Day 176 (7-day follow-up after vaccination)
Number of Participants with Unsolicited Adverse Events (AEs)Up to Day 197 (28-day follow-up after vaccination)
Number of Participants with SAEs, MAAEs, Any AEs Leading to Withdrawal From Study/Discontinuation of Study Vaccine and AEs of Special Interest (AESIs)Day 1 to end of study (EOS) (Day 505)
Number of Participants with Laboratory AbnormalitiesUp to Day 176 (7-day follow-up after vaccination)

Secondary

MeasureTime frameDescription
Geometric Mean Titer (GMT) of B-Cell Neutralizing Antibody (nAb)Days 1, 85, and 197
Geometric Mean Concentration (GMC) of Antigen-specific Binding Antibody (bAb)Days 1, 85, and 197
Geometric Mean Fold Rise (GMFR) of B-Cell nAb and Antigen-specific bAbDays 1, 85, and 197
Number of Participants with Seroresponse of B-Cell nAbs and Antigen-specific bAbsDays 1, 85, and 197The number of participants with seroresponse for EBV-specific (vaccine antigen) binding and nAbs responses and with \>2-, 3-, and 4-fold increases in serum binding or nAb titers from baseline will be analyzed with 2-sided 95% CI using the Clopper-Pearson method by treatment arm and baseline EBV serostatus, and timepoint.

Countries

United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: May 7, 2026