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V175

Phase 1

Lower Respiratory Tract Infection | Monoclonal antibody | Infectious Disease |Merck & Company, Inc.|Last Updated: Oct 2, 2026

Development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Oct 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment564

FDA Designations

No designations recorded

Clinical trial landscape

V175 · 1 trial · 1 indication

Phase 1 1
NCT07855510A Clinical Trial of V175 and V175A in Healthy AdultsLower Respiratory Tract Infection
NOT YET_RECRUITING564 Analytics
PHASE1NOT YET_RECRUITING
A Clinical Trial of V175 and V175A in Healthy Adults
Lower Respiratory Tract InfectionUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants With Immediate Reactions After Vaccination
Up to approximately 30 minutes after vaccination

The percentage of participants with immediate reactions after vaccination will be reported.

Percentage of Participants With a Solicited Injection-Site Adverse Event
Up to approximately 7 days after vaccination

An adverse event (AE) is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The percentage of participants with a solicited injection-site AE (ie, pre-listed in the participant's diary) will be reported.

Percentage of Participants With a Solicited Systemic Adverse Event
Up to approximately 7 days after vaccination

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. The percentage of participants with a solicited systemic AE (ie, pre-listed in the participant's diary) will be reported.

Percentage of Participants With an Unsolicited Adverse Event
Up to approximately 28 days after vaccination

An unsolicited AE is an AE that was not solicited using a vaccination report card and that is communicated by a participant (or their legally acceptable representative, if applicable). Unsolicited AEs include serious and nonserious AEs. The percentage of participants with an unsolicited adverse event will be reported.

Percentage of Participants With a Serious Adverse Event (SAE)
Up to approximately 12 months after vaccination

An SAE is defined as any untoward medical occurrence that at any dose, results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, or is a congenital anomaly/birth defect. The percentage of participants with a SAE will be reported.

Percentage of Participants With a Medically Attended Adverse Event (MAAE)
Up to approximately 12 months after vaccination

MAAEs are defined as adverse events in which medical attention is received during an unscheduled, non-routine outpatient visit, such as an emergency department visit, office visit, or an urgent care visit with any medical personnel for any reason. The percentage of participants with a MAAE will be reported.

Percentage of Participants With an Adverse Event of Special Interest (AESI) Including Potential Immune-Mediated Diseases (pIMDs)
Up to approximately 12 months after vaccination

AESIs are selected serious and nonserious AEs which include but are not limited to pIMDs defined as a subset of AEs that includes both: established autoimmune disease(s) and inflammatory and/or neurologic disorder(s), which might or might not have an autoimmune etiology. The percentage of participants with an AESI will be reported.

Secondary Endpoints

Geometric Mean Ratio (GMR) of Anti-Respiratory Syncytial Virus-A (RSV-A) Neutralizing Antibodies Elicited by V175/V175A Relative to Control Vaccine
Up to approximately 28 days after vaccination
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelSEQUENTIAL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
V175EXPERIMENTALParticipants will receive a single intramuscular (IM) vaccination of V175 on Day 1.
V175AEXPERIMENTALParticipants will receive a single IM vaccination of V175A on Day 1.
Control VaccineACTIVE_COMPARATORParticipants will receive a single IM vaccination of control vaccine on Day 1.
PlaceboPLACEBO_COMPARATORParticipants will receive a single IM vaccination of placebo on Day 1.

Interventions

NameTypeDescription
V175BIOLOGICALIntramuscular administration
V175ABIOLOGICALIntramuscular administration
Control VaccineBIOLOGICALIntramuscular administration
PlaceboOTHERIntramuscular administration
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Eligibility Criteria

Age Range18 Years to 84 Years
SexALL
Healthy VolunteersYes

Inclusion Criteria: The main inclusion criteria include but are not limited to the following: * Is in good health * Is an individual of any sex/gender, from 18 years to 49 years of age inclusive, or 60 years to 84 years of age inclusive * Has a body mass index between 18 and 35 kg/m\^2, inclusive ...

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Recent Changes (Last 90 Days)

LOWOct 2, 2026NCT07855510NEW_TRIAL: changed
LOWOct 2, 2026NCT07855510NEW_TRIAL: changed

Frequently asked questions about V175

What is V175?

V175 is an investigational monoclonal antibody being developed by Merck & Company, Inc. (ticker MRK) for lower respiratory tract infection. It is in Phase 1 clinical development and has not been approved. The program includes one registered trial, which is not yet recruiting.

What is V175 used for?

V175 is being studied for lower respiratory tract infection. The only registered trial of V175 enrolls healthy adult volunteers rather than patients with active infection, so the current work is early-stage and focused on the healthy volunteer setting. No approved use has been established for V175.

Who makes V175?

V175 is developed by Merck & Company, Inc., which trades under the ticker MRK. Merck is the sponsor of the single registered Phase 1 trial of V175, listed as NCT07855510, titled A Clinical Trial of V175 and V175A in Healthy Adults.

What phase is V175 in?

V175 is in Phase 1 clinical development. It is investigational and has not been approved. The program has one registered trial, which is currently not yet recruiting, and no completed trials. The trial is a randomized, double-blind, placebo-controlled Phase 1 study.

What clinical trials is V175 in?

V175 is being studied in one registered trial, NCT07855510, titled A Clinical Trial of V175 and V175A in Healthy Adults. It is a Phase 1, randomized, double-blind, placebo-controlled study in lower respiratory tract infection, with a planned enrollment of 564 participants aged 18 years and older.

Is V175 tested in healthy volunteers?

Yes. The Phase 1 trial of V175, NCT07855510, is conducted in healthy adults aged 18 years and older of all sexes. It is a randomized, double-blind, placebo-controlled study with a planned enrollment of 564 participants and is listed as not yet recruiting.