Recent Updates
Recently added Catalysts

RSV/hMPV vaccine candidate Dose L

Phase 1

Respiratory Syncytial Virus Infection | Monoclonal antibody | Infectious Disease |Sanofi|Last Updated: Mar 12, 2026

Target and mechanism

ModalityMonoclonal antibody

Also known as Licensed RSV Vaccine

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials2
Total Enrollment1,204

FDA Designations

No designations recorded

Clinical trial landscape

RSV/hMPV vaccine candidate Dose L · 2 trials · 4 indications

Phase 1 2
NCT06237296Study of the Safety and Immune Response of an Investigational mRNA Vaccine for the Prevention of Respiratory Syncytial Virus and/or Human Metapneumovirus in Participants Aged 18 to 49 Years and 60 Years and OlderRespiratory Syncytial Virus Infection
COMPLETED558 Analytics
NCT06134648Study of a Respiratory Syncytial Virus/Human Metapneumovirus Vaccine CandidateRespiratory Syncytial Virus Infection
COMPLETED646 Analytics
PHASE1COMPLETED
Study of the Safety and Immune Response of an Investigational mRNA Vaccine for the Prevention of Respiratory Syncytial Virus and/or Human Metapneumovirus in Participants Aged 18 to 49 Years and 60 Years and Older
Respiratory Syncytial Virus InfectionUnlock trial analytics
PHASE1COMPLETED
Study of a Respiratory Syncytial Virus/Human Metapneumovirus Vaccine Candidate
Respiratory Syncytial Virus InfectionUnlock trial analytics

Study Endpoints

Primary Endpoints

Presence of unsolicited systemic immediate adverse events (AEs)
Within 30 minutes after vaccination

Number of participants experiencing immediate an immediate unsolicited systemic adverse event

Presence of solicited injection site or systemic reactions
Within 7 days after vaccination

Number of participants reporting: * injection site reactions: pain, erythema and swelling * systemic reactions: fever, headache, fatigue, myalgia, arthralgia and chills

Presence of unsolicited AEs
Within 28 days after vaccination

Number of participants experiencing unsolicited AEs

Presence of medically attended adverse events (MAAEs)
Throughout study (up to approximately 6 months)

Number of participants experiencing MAAEs

Presence of serious adverse events (SAEs)
Throughout study (up to approximately 6 months)

Throughout study (up to approximately 6 months)

Presence of adverse events of special interest (AESIs)
Throughout study (up to approximately 6 months)

Number of participants experiencing AESIs

Presence of out-of-range biological test results
Within 7 days after vaccination

Number of participants with biological safety assessment values out of normal range (as per the laboratory performing the test, including shift from baseline values)

RSV-A serum neutralizing antibody (nAb) titers at pre-vaccination (D01) and 28 days post- vaccination (D29) in the RSV/hMPV and monovalent RSV formulations
Day 1 and Day 29

RSV-A serum nAb titers at pre-vaccination (D01), 28 days (D29) post-vaccination

RSV-B serum neutralizing antibody (nAb) titers at pre-vaccination (D01) and 28 days post- vaccination (D29) in the RSV/hMPV and monovalent RSV formulations
Day 1 and Day 29

RSV-B serum nAb titers at pre-vaccination (D01), 28 days (D29) post-vaccination

hMPV- A serum neutralizing antibody (nAb) titers at pre-vaccination (D01) and 28 days post- vaccination (D29) in the RSV/hMPV and monovalent hMPV formulations
Day 1 and Day 29

hMPV-A serum nAb titers at pre-vaccination (D01), 28 days (D29) post-vaccination

Presence of related SAEs
Throughout study (approximately 24 months)

Number of participants experiencing related SAEs

Presence of related AESIs
Throughout study (approximately 24 months)

Number of participants experiencing related AESIs

Presence of fatal SAEs
Throughout study (approximately 24 months)

Number of participants experiencing fatal SAEs

RSV-A serum neutralizing antibody (nAb) titers at pre-vaccination (D01) and 28 days post- primary vaccination (D29) in Phase IIa (Main/Booster Cohort)
Day 1 and Day 29

RSV-A serum neutralizing antibody (nAb) titers at pre-vaccination (D01) and 28 days post- primary vaccination (D29)

hMPV serum nAb titers at pre-vaccination (D01), 28 days post-primary vaccination (D29) in Phase IIa (Main/Booster Cohort)
Day 1 and Day 29

hMPV serum nAb titers at pre-vaccination (D01), 28 days post-primary vaccination (D29)

Secondary Endpoints

RSV A serum nAb titers at pre vaccination (D01), 28 days (D29), 3 months (D91), and 6 months (D181) post vaccination in the monovalent RSV formulation
Day 1, Day 29, Day 91 and Day 181
RSV B serum nAb titers at pre vaccination (D01), 28 days (D29), 3 months (D91), and 6 months (D181) post vaccination in the monovalent RSV formulation
Day 1, Day 29, Day 91 and Day 181
RSV A serum anti-F immunoglobulin G (IgG) antibody (Ab) titers at pre-vaccination (D01), 28 days (D29), 3 months (D91), and 6 months (D181) post vaccination in the monovalent RSV formulation
Day 1, Day 29, Day 91 and Day 181
Unlock Study Endpoints

Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
RSV/hMPV mRNA / LNP 1 Group 1EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV/hMPV mRNA / LNP vaccine 1 dose 1.
RSV/hMPV mRNA / LNP 1 Group 2EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV/hMPV mRNA / LNP vaccine 1 dose 2.
RSV/hMPV mRNA / LNP 1 Group 3EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV/hMPV mRNA / LNP vaccine 1 dose 3.
RSV/hMPV mRNA / LNP 2 Group 4EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV/hMPV mRNA / LNP vaccine 2 dose 1.
RSV mRNA / LNP 1 Group 5EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV mRNA / LNP vaccine 1 dose 1.
hMPV mRNA / LNP 1 Group 6EXPERIMENTALParticipants will be randomized to receive a single IM injection of hMPV mRNA / LNP vaccine 1 dose 1.
RSV/hMPV mRNA / LNP 1 Group 7EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV/hMPV mRNA / LNP vaccine 1 dose 4.
Sentinel Cohort: RSV/hMPV Group 0 (Dose L)EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV/hMPV vaccine candidate
Sentinel Cohort: RSV/hMPV Group 1 (Dose A)EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV/hMPV vaccine candidate
Sentinel Cohort: RSV/hMPV Group 2 (Dose B)EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV/hMPV vaccine candidate
Sentinel Cohort: Placebo-Group 3PLACEBO_COMPARATORParticipants will be randomized to receive a single IM injection of placebo
Main Cohort: RSV/hMPV Group 1 (Dose A)EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV/hMPV vaccine candidate
Main Cohort: RSV/hMPV Group 2 (Dose B)EXPERIMENTALParticipants will be randomized to receive a single IM injection of RSV/hMPV vaccine candidate
Main Cohort: Placebo-Group 3PLACEBO_COMPARATORParticipants will be randomized to receive a single IM injection of placebo
Booster Cohort-RSV/hMPVEXPERIMENTALParticipants will be randomized to receive a determined dose of single IM injection of RSV/hMPV vaccine candidate from a subset of Main cohort
Booster Cohort-PlaceboPLACEBO_COMPARATORParticipants will be randomized to receive of single IM injection of placebo from a subset of Main cohort

Interventions

NameTypeDescription
RSV/hMPV mRNA LNP 1BIOLOGICALPharmaceutical form:Suspension for injection-Route of administration:Intramuscular Injection
RSV/hMPV mRNA LNP 2BIOLOGICALPharmaceutical form:Suspension for injection-Route of administration:Intramuscular Injection
RSV mRNA LNP 1BIOLOGICALPharmaceutical form:Suspension for injection-Route of administration:Intramuscular Injection
hMPV mRNA LNP 1BIOLOGICALPharmaceutical form:Suspension for injection-Route of administration:Intramuscular Injection
RSV/hMPV vaccine candidate Dose LBIOLOGICALPharmaceutical form:Suspension for injection-Route of administration:Intramuscular Injection
RSV/hMPV vaccine candidate Dose ABIOLOGICALPharmaceutical form:Suspension for injection-Route of administration:Intramuscular Injection
RSV/hMPV vaccine candidate Dose BBIOLOGICALPharmaceutical form:Suspension for injection-Route of administration:Intramuscular Injection
PlaceboBIOLOGICALPharmaceutical form:Suspension for injection-Route of administration:Intramuscular Injection
Unlock Study Design Details

Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersYes
Study Sites17

Inclusion Criteria: -Informed consent form (ICF) has been signed and dated Exclusion Criteria: Participants are excluded from the study if any of the following criteria apply: -Any condition which, in the opinion of the Investigator, might interfere with the evaluation of the study objectives. ...

Countries:United StatesAustraliaPuerto Rico
Unlock Eligibility Criteria

Frequently asked questions about RSV/hMPV vaccine candidate Dose L

What is RSV vaccine formulation 1 dose used for?

RSV vaccine formulation 1 dose is an investigational vaccine being developed for the prevention of Respiratory Syncytial Virus (RSV) infection and immunization. It is also being studied for use against Human Metapneumovirus (hMPV) infection. The vaccine is intended for healthy adults, including those aged 18 to 49 years and older adults aged 60 years and above.

Who makes RSV vaccine formulation 1 dose?

RSV vaccine formulation 1 dose is being developed by Sanofi, a global biopharmaceutical company. Sanofi is listed on the stock exchange under the ticker symbol SNY. The vaccine is currently in Phase 1 clinical development for the prevention of RSV infection and related respiratory conditions.

What phase is RSV vaccine formulation 1 dose in?

RSV vaccine formulation 1 dose is in Phase 1 clinical development. It is an investigational vaccine and has not been approved by regulatory authorities. The vaccine is being studied in early-stage trials to evaluate its safety and immune response in healthy participants, including adults aged 18 to 49 years and older adults aged 60 years and above.

What clinical trials is RSV vaccine formulation 1 dose in?

RSV vaccine formulation 1 dose has been studied in several Phase 1 clinical trials. These include NCT06134648, which evaluated a combined RSV and Human Metapneumovirus vaccine candidate in 646 participants aged 60 years and older in the United States and Puerto Rico. Other trials include NCT06237296, NCT06583031, and NCT07071558, all completed, with total enrollment across trials of 2640 participants.

Is RSV vaccine formulation 1 dose the same as Licensed RSV Vaccine?

Yes, RSV vaccine formulation 1 dose is also known as Licensed RSV Vaccine and RSV+HMPV vaccine. These alternative names refer to the same investigational vaccine candidate being developed by Sanofi for the prevention of RSV and Human Metapneumovirus infections. The vaccine is currently in Phase 1 clinical trials and is not yet licensed.

How does RSV vaccine formulation 1 dose work?

RSV vaccine formulation 1 dose is a vaccine designed to stimulate the immune system to produce a protective response against Respiratory Syncytial Virus (RSV) and Human Metapneumovirus (hMPV). By presenting viral antigens, the vaccine aims to generate antibodies and immune memory that can prevent or reduce the severity of RSV and hMPV infections in vaccinated individuals.