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mRNA-1189

Phase 1

Epstein-Barr Virus Infection | Monoclonal antibody | Infectious Disease |Moderna, Inc.|Last Updated: May 6, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment867

FDA Designations

No designations recorded

Clinical trial landscape

mRNA-1189 · 2 trials · 2 indications

Phase 1 2
NCT07478952A Study of an Epstein-Barr Virus (EBV) Candidate Vaccine, mRNA-1189 in Healthy Adults 18 to 30 Years of AgeEpstein-Barr Virus
RECRUITING120 Analytics
NCT05164094A Study of an Epstein-Barr Virus (EBV) Candidate Vaccine, mRNA-1189, in 10- to 30-Year-Old Healthy Adolescents and AdultsEpstein-Barr Virus Infection
ACTIVE NOT_RECRUITING867 Analytics
PHASE1RECRUITING
A Study of an Epstein-Barr Virus (EBV) Candidate Vaccine, mRNA-1189 in Healthy Adults 18 to 30 Years of Age
Epstein-Barr VirusUnlock trial analytics
PHASE1ACTIVE NOT_RECRUITING
A Study of an Epstein-Barr Virus (EBV) Candidate Vaccine, mRNA-1189, in 10- to 30-Year-Old Healthy Adolescents and Adults
Epstein-Barr Virus InfectionUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants with Solicited Local and Systemic Adverse Reactions (ARs)
Up to Day 64 (7-day follow-up after vaccination)
Number of Participants with Unsolicited Adverse Events (AEs)
Up to Day 85 (28-day follow-up after vaccination)
Number of Participants with Medically Attended Adverse Events (MAAEs)
Day 1 up to Day 225
Number of Participants With Serious Adverse Events (SAEs), 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 225)
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 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 Abnormalities
Up to Day 176 (7-day follow-up after vaccination)

Secondary Endpoints

Geometric Mean Titer of Antigen-Specific Binding Antibody (bAb)
Days 1 and 85
Geometric Mean Fold Rise (GMFR) of Antigen-Specific bAb
Day 85
Number of Participants With Seroconversion of Antigen-Specific bAbs
Day 85
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
mRNA-1189 Dose Level 1 (ID)EXPERIMENTALParticipants will receive 2 intradermal (ID) injections of mRNA-1189 at Dose Level 1 on Days 1 and 57.
mRNA-1189 Dose Level 2 (ID)EXPERIMENTALParticipants will receive 2 ID injections of mRNA-1189 at Dose Level 2 on Days 1 and 57.
mRNA-1189 Dose Level 1 (IM)EXPERIMENTALParticipants will receive 2 intramuscular (IM) injections of mRNA-1189 at Dose Level 1 on Days 1 and 57.
mRNA-1189 Dose Level 2 (IM)EXPERIMENTALParticipants will receive 2 IM injections of mRNA-1189 at Dose Level 2 on Days 1 and 57.
Part A: mRNA-1189 Dose Level 2EXPERIMENTALParticipants will receive 3 intramuscular (IM) injections of mRNA-1189 at Dose Level 2 on Days 1, 57, and 169.
Part A: mRNA-1189 Dose Level 3EXPERIMENTALParticipants will receive 3 IM injections of mRNA-1189 at Dose Level 3 on Days 1, 57, and 169.
Part A: mRNA-1189 Dose Level 4EXPERIMENTALParticipants will receive 3 IM injections of mRNA-1189 at Dose Level 4 on Days 1, 57, and 169.
Part A: PlaceboPLACEBO_COMPARATORParticipants will receive 3 IM injection of study drug-matching placebo on Days 1, 57, and 169.
Part B: mRNA-1189 Dose Level 1EXPERIMENTALParticipants will receive 3 IM injections of mRNA-1189 at Dose Level 1 on Days 1, 57, and 169.
Part B: mRNA-1189 Dose Level 2EXPERIMENTALParticipants will receive 3 IM injections of mRNA-1189 at Dose Level 2 on Days 1, 57, and 169.
Part B: mRNA-1189 Dose Level 3EXPERIMENTALParticipants will receive 3 IM injections of mRNA-1189 at Dose Level 3 on Days 1, 57, and 169.
Part B: mRNA-1189 Dose Level 4EXPERIMENTALParticipants will receive 3 IM injections of mRNA-1189 at Dose Level 4 on Days 1, 57, and 169.
Part B: PlaceboPLACEBO_COMPARATORParticipants will receive 3 IM injection of study drug-matching placebo on Days 1, 57, and 169.
Part C: mRNA-1189 Dose Level 1EXPERIMENTALParticipants will receive 3 IM injections of mRNA-1189 at Dose Level 1 on Days 1, 57, and 169.
Part C: mRNA-1189 Dose Level 2EXPERIMENTALParticipants will receive 3 IM injections of mRNA-1189 at Dose Level 2 on Days 1, 57, and 169.
Part C: mRNA-1189 Dose Level 3EXPERIMENTALParticipants will receive 3 IM injections of mRNA-1189 at Dose Level 3 on Days 1, 57, and 169.
Part C: PlaceboPLACEBO_COMPARATORParticipants will receive 3 IM injection of study drug-matching placebo on Days 1, 57, and 169.

Interventions

NameTypeDescription
mRNA-1189BIOLOGICALSterile liquid for injection
PlaceboBIOLOGICAL0.9% sodium chloride (normal saline) injection
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Eligibility Criteria

Age Range18 Years to 30 Years
SexALL
Healthy VolunteersYes
Study Sites2

Inclusion Criteria: * Healthy as determined by medical evaluation including medical history and physical examination. * Participants who are assigned female at birth or could become pregnant are eligible to participate if the participant is not pregnant or breast/chest feeding. Exclusion Criteria:...

Countries:AustraliaUnited States
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Recent Changes (Last 90 Days)

LOWMay 26, 2026NCT07478952Status: NOT_YET_RECRUITING → RECRUITING
MEDIUMMay 26, 2026NCT05164094primaryCompletionDate: changed
LOWMay 24, 2026NCT07478952studyFirstPostDate: changed
LOWMay 24, 2026NCT05164094studyFirstPostDate: changed

Frequently asked questions about mRNA-1189

What is mRNA-1189 used for?

mRNA-1189 is an investigational messenger RNA (mRNA) vaccine being developed for the prevention of Epstein-Barr Virus (EBV) infection. It is currently in Phase 1 clinical trials studying healthy adolescents and adults. The vaccine is designed to target EBV, the virus that causes infectious mononucleosis and is associated with certain cancers.

Who makes mRNA-1189?

mRNA-1189 is being developed by Moderna, Inc., a biotechnology company publicly traded under the ticker symbol MRNA on the NASDAQ exchange. Moderna is conducting clinical trials of this EBV candidate vaccine in the United States and Australia.

What phase is mRNA-1189 in?

mRNA-1189 is currently in Phase 1 clinical development. It is an investigational vaccine and has not been approved by regulatory authorities. Two Phase 1 trials are ongoing, one in the United States and one in Australia, studying the vaccine in healthy adolescents and adults.

What clinical trials is mRNA-1189 in?

mRNA-1189 is being studied in two Phase 1 clinical trials. The first, NCT05164094, is an active but not recruiting study in the United States enrolling 867 healthy adolescents and adults aged 10 to 30 years. The second, NCT07478952, is recruiting 120 healthy adults aged 18 to 30 years in Australia.

How does mRNA-1189 work?

mRNA-1189 is an mRNA vaccine that works by instructing cells to produce a viral protein that triggers an immune response against Epstein-Barr Virus. This approach aims to generate protective antibodies and immune memory to prevent EBV infection. The vaccine is administered to healthy individuals to elicit immunity.

Is mRNA-1189 the same as other EBV vaccines?

mRNA-1189 is a specific mRNA-based vaccine candidate developed by Moderna for Epstein-Barr Virus. It is not the same as other EBV vaccines in development, which may use different technologies such as protein subunits or viral vectors. mRNA-1189 is unique to Moderna's pipeline.