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A Study of an Epstein-Barr Virus (EBV) Candidate Vaccine, mRNA-1195, in 18- to 55-Year-Old Healthy Participants

A Phase 1, Randomized, Observer-Blind, Placebo-Controlled, 2-Part, Dose-Ranging Study of an EBV Candidate Vaccine, mRNA-1195, in Healthy Participants 18 Through 55 Years of Age

Status
Active, not recruiting
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT05831111
Enrollment
482
Registered
2023-04-26
Start date
2023-04-05
Completion date
2026-10-13
Last updated
2026-08-11

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, Virus Diseases, Infections, Gamma-herpesvirus

Brief summary

The purpose of this study is to evaluate the safety and reactogenicity of mRNA-1195 in healthy participants.

Detailed description

There will be 2 sequential parts to the study: * Participants 18 through 55 years of age will be enrolled in Part A of the study first, which will only enroll those participants who are EBV-seropositive at Screening. * Part B will enroll participants 18 through 30 years of age who are either EBV-seronegative or EBV-seropositive at Screening.

Interventions

BIOLOGICALmRNA-1195.1

Sterile liquid for injection

BIOLOGICALmRNA-1195.2

Sterile liquid for injection

BIOLOGICALmRNA-1189

Sterile liquid for injection

BIOLOGICALPlacebo

0.9% sodium chloride (normal saline) injection

BIOLOGICALmRNA-1195

Sterile liquid for injection

Sponsors

ModernaTX, Inc.
Lead SponsorINDUSTRY

Study design

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

Eligibility

Sex/Gender
ALL
Age
18 Years to 55 Years
Healthy volunteers
Yes

Inclusion criteria

Key Inclusion Criteria: * For Part A: Positive EBV serostatus at Screening. For Part B: Negative EBV serostatus or Positive EBV serostatus at Screening. * According to the assessment of the Investigator, is in good general health and can comply with study procedures. * For 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 Day 1, agreement to continue adequate contraception through 3 months following last study injection and is not currently breast/chest feeding. Key

Exclusion criteria

* Participant is acutely ill or febrile (temperature ≥38.0 degrees Celsius \[°C\]/100.4 degrees Fahrenheit \[°F\]) 72 hours prior to or at the Screening Visit or Day 1. * 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). * Any medical, psychiatric, or occupational condition, including reported history of drug or alcohol abuse, that, in the opinion of the Investigator, might pose additional risk due to participation in the study or could interfere with the interpretation of study results. * History of myocarditis, pericarditis, or myopericarditis. * Participant has received systemic immunosuppressants or immune-modifying drugs for \>14 days in total within 6 months prior to Screening Visit (for corticosteroids ≥10 milligrams \[mg\]/day of prednisone or equivalent) or is anticipating the need for immunosuppressive treatment at any time during participation in the study. Topical corticosteroids and tacrolimus are allowed. * Participant 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 injection, with the exception of licensed/authorized influenza vaccines, which may be received more than 14 days before or after any study injection. * Participant has donated ≥450 milliliters (mL) of blood products within 28 days prior to the Screening Visit or plans to donate blood products during the study. 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 Any Serious AEs (SAEs), Medically Attended AEs (MAAEs), AEs Leading to Discontinuation of Study Intervention and/or Study Participation, and AEs of Special Interest (AESIs)Part A and B: Day 1 to end of study (EOS) (Part A: Day 337; Part B: Day 505)

Secondary

MeasureTime frame
Geometric Mean Titer (GMT) of B-Cell Neutralizing Antibody (nAb) and/or Antigen-Specific Binding Antibody (bAb)Days 1, 85, and 197
Geometric Mean Fold Rise (GMFR) of B-Cell nAb and/or Antigen-Specific bAbDays 1, 85, and 197
Number of Participants With Seroresponse of B-Cell nAbs and/or Antigen-Specific bAbsDays 1, 85, and 197

Countries

United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Aug 12, 2026