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mRNA-1608

Phase 1

Genital Herpes | Monoclonal antibody | Infectious Disease |Moderna, Inc.|Last Updated: May 8, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLED
Total Trials1
Total Enrollment303

FDA Designations

No designations recorded

Clinical trial landscape

mRNA-1608 · 1 trial · 1 indication

Phase 1 1
NCT06033261A Study of mRNA-1608, a Herpes Simplex Virus -2 (HSV-2) Therapeutic Candidate Vaccine, in Healthy Adults 18 to 55 Years of Age With Recurrent HSV-2 Genital HerpesGenital Herpes
COMPLETED303 Analytics
PHASE1COMPLETED
A Study of mRNA-1608, a Herpes Simplex Virus -2 (HSV-2) Therapeutic Candidate Vaccine, in Healthy Adults 18 to 55 Years of Age With Recurrent HSV-2 Genital Herpes
Genital HerpesUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants With Solicited Local and Systemic ARs
Up to Day 64 (Within 7 days after study vaccination)

Solicited ARs were collected in an electronic diary (eDiary). Local ARs: injection site pain, erythema (redness), swelling/induration (hardness); and axillary (underarm) swelling or tenderness ipsilateral to the side of injection. Systemic ARs: fever, headache, fatigue, myalgia, arthralgia, nausea/vomiting, and chills. Note, not all solicited ARs were considered adverse events (AEs). Investigator reviewed whether the solicited AR was also to be recorded as an AE. A Summary of serious AEs (SAEs) and nonserious AEs ("Other"), regardless of causality, is located in the "Reported Adverse Events" section.

Number of Participants With Unsolicited Adverse Events (AEs)
Up to Day 85 (Up to 28 days after study vaccination)

An AE was defined as any untoward medical occurrence associated with the use of a drug in humans, whether or not considered drug related. Any abnormal laboratory test result (hematology, clinical chemistry, or prothrombin time \[PT\]/partial thromboplastin time \[PTT\]) or other safety assessment (for example, electrocardiogram, radiological scan, vital sign measurement), including one that worsened from baseline and was considered clinically significant in the medical and scientific judgment of the Investigator was recorded as an AE. A summary of SAEs and all nonserious AEs ("Other"), regardless of causality, is located in the "Reported Adverse Events" section.

Number of Participants With Serious Adverse Events (SAEs), Adverse Events of Special Interest (AESIs), and AEs Leading to Study Discontinuation
Day 1 through Day 393

An SAE was defined as any AE that resulted in death, was life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in disability, was a congenital anomaly/birth defect, or was an important medical event. An AESI was an AE (serious or nonserious) of scientific and medical concern specific to the Sponsor's product or program, for which ongoing monitoring and immediate notification by the Investigator to the Sponsor were required. A summary of SAEs and all nonserious AEs ("Other"), regardless of causality, is located in the "Reported Adverse Events" section.

Number of Participants With Medically Attended AEs (MAAEs)
Day 1 through Day 393

A MAAE is an AE that led to an unscheduled visit to a healthcare practitioner. A summary of SAEs and all nonserious AEs ("Other"), regardless of causality, is located in the "Reported Adverse Events" section.

Secondary Endpoints

Number of Genital Herpes Recurrence Episode Per Participant, Counted Starting 14 Days After the Second Study Injection to 6 Months After Second Study Injection
Day 71 up to Day 225
Number of Genital Herpes Recurrence Episode Per Participant, Counted Starting 14 Days After the Second Study Injection to 12 Months After Second Study Injection
Day 71 up to Day 393
Change From Baseline (28 Days Prior to the First Study Injection) to 2 Months After the Second Study Injection in Genital Herpes Lesion Rate (Percentage of Days With Lesions Present)
Baseline (Day -27 to Day 1), Day 113
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
mRNA-1608 Dose AEXPERIMENTALParticipants will receive 2 intramuscular (IM) injections of mRNA-1608 at Dose Level A, each dose administered at 0 and 2 months (Day 1 and Day 57).
mRNA-1608 Dose BEXPERIMENTALParticipants will receive 2 IM injections of mRNA-1608 at Dose Level B, each dose administered at 0 and 2 months (Day 1 and Day 57).
mRNA-1608 Dose CEXPERIMENTALParticipants will receive 2 IM injections of mRNA-1608 at Dose Level C, each dose administered at 0 and 2 months (Day 1 and Day 57).
BEXSEROOTHERParticipants will receive 2 IM injections of BEXSERO, each dose administered at 0 and 2 months (Day 1 and Day 57).

Interventions

NameTypeDescription
mRNA-1608BIOLOGICALSterile liquid for injection
BEXSEROBIOLOGICALA vaccine indicated for active immunization to prevent invasive disease caused by Neisseria meningitidis serogroup B.
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Eligibility Criteria

Age Range18 Years to 55 Years
SexALL
Healthy VolunteersYes
Study Sites23

Inclusion Criteria: * Participant has a diagnosis of genital HSV-2 infection for at least 1 year before the Screening Visit. * Seropositive for HSV-2 as determined by Western Blot. * Participant has a history of recurrent genital herpes defined as at least 3 and no more than 9 reported genital herp...

Countries:United States
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Recent Changes (Last 90 Days)

MEDIUMJun 8, 2026NCT06033261TRIAL_REMOVED: changed
MEDIUMJun 8, 2026NCT06033261TRIAL_REMOVED: changed
MEDIUMJun 8, 2026NCT06033261TRIAL_REMOVED: changed
MEDIUMJun 8, 2026NCT06033261TRIAL_REMOVED: changed
MEDIUMJun 8, 2026NCT06033261TRIAL_REMOVED: changed

Frequently asked questions about mRNA-1608

What is mRNA-1608 used for?

mRNA-1608 is an investigational therapeutic candidate vaccine being studied for the treatment of recurrent genital herpes caused by herpes simplex virus type 2 (HSV-2). It is designed for healthy adults aged 18 to 55 years with a history of recurrent HSV-2 genital herpes.

Who makes mRNA-1608?

mRNA-1608 is being developed by Moderna, Inc., a biotechnology company traded on the Nasdaq under the ticker symbol MRNA. The company is conducting clinical research on this candidate vaccine for genital herpes.

What phase is mRNA-1608 in?

mRNA-1608 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. A Phase 1 study has been completed, but the candidate remains in early-stage clinical testing.

What clinical trials is mRNA-1608 in?

mRNA-1608 has one completed clinical trial, registered as NCT06033261. This Phase 1 study enrolled 303 participants in the United States and evaluated the candidate vaccine in healthy adults aged 18 to 55 years with recurrent HSV-2 genital herpes.

Is mRNA-1608 a vaccine or a monoclonal antibody?

mRNA-1608 is classified as a therapeutic candidate vaccine, not a monoclonal antibody. It is designed to treat genital herpes caused by HSV-2, and the completed Phase 1 trial was a randomized, double-blind, controlled study.