Safety and Serum Virus Neutralizing Antibody Responses of VYD2311, a COVID-19 Vaccine, and Coadministered VYD2311 With a COVID-19 Vaccine (LIBERTY)

June 12, 2026 updated by: Invivyd, Inc.

A Phase 3, Randomized, Double-Blind Study to Evaluate the Safety, Serum Virus Neutralizing Antibody Responses, and Pharmacokinetics of VYD2311, a COVID-19 Vaccine, and Coadministered VYD2311 With a COVID-19 Vaccine

The main purposes of this research study are to measure the safety (whether it causes any side effects), tolerability (if it does cause any side effects, how well your body is able to handle them), and reactions, both local at the injection site and systemic, that may occur in the body after receiving VYD2311, or a COVID-19 vaccine, or a combination of VYD2311 and a COVID-19 vaccine in healthy participants. This research study will measure the amount of serum virus neutralizing antibodies produced in the blood (antibodies that block a virus from infecting cells) and pharmacokinetics of VYD2311 compared to a COVID-19 vaccine, when each is administered alone or concurrently. Pharmacokinetics is the study of how a drug moves through the body, including how it is absorbed (taken into the body), distributed (spread throughout the body), metabolized (broken down in the body), and eliminated (removed from the body), and how the body affects the drug.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

210

Phase

  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  1. Is a healthy adult male or female aged 18 to 49 years, inclusive, weighing at least 40 kg at the time of Screening
  2. Has a body mass index (BMI) 18.0 to 32.0 mg/kg2, inclusive.
  3. Is in good health, with no clinically significant abnormalities as determined by the Investigator based on medical history, physical exam, vital signs, and ECG per study site standard operating procedures.

Exclusion Criteria:

  1. Prior receipt of VYD2311 or pemivibart (VYD222).
  2. Prior receipt of a COVID-19 vaccine within 6 months before Day 0 and prior receipt of a non-COVID-19 vaccine within 28 days before Day 0.
  3. Prior receipt of convalescent plasma, a mAb to SARS-CoV-2 (other than VYD2311 or pemivibart), or IVIG within 6 months before Day 0.
  4. Prior known or suspected SARS-CoV-2 infection within 6 months before Day 0.
  5. Tests positive for current SARS-CoV-2 infection by RAT or local nucleic acid amplification test (eg, RT-PCR) on Day 0.
  6. Exposure to someone with known or suspected SARS-CoV-2 infection in the 5 days before Day 0.
  7. Is acutely ill, including symptoms suggestive of SARS-CoV-2 infection, in the opinion of the investigator or has a fever ≥38oC (≥100.4oF) within 14 days of Day 0.
  8. Any chronic or significant medical condition that, in the opinion of the Investigator, might compromise participant safety or interfere with evaluation of the study drug or interpretation of participant safety or study results.

NOTE: The above information is not intended to contain all considerations relevant to a participant's potential eligibility in the clinical trial.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Treatment Arm 1: A COVID-19 vaccine and Placebo administered as 2 separate IM injections
Treatment Arm 1: A COVID-19 vaccine administered by IM injection and placebo administered by IM injection in separate locations
Drug: COVID-19 mRNA vaccine
A one-time dose of COVID-19 mRNA vaccine will be administered by intramuscular injection.
Drug: Placebo (Normal Saline)
A one-time dose of normal saline (placebo) administered by intramuscular injection.
Active Comparator: Treatment Arm 2: VYD2311 and Placebo administered as 2 separate IM injections
Treatment Arm 2: VYD2311 250 mg administered by IM injection and placebo administered by IM injection in separate locations
Drug: Placebo (Normal Saline)
A one-time dose of normal saline (placebo) administered by intramuscular injection.
Drug: VYD2311
A one-time dose of VYD2311 250mg will be administered by intramuscular injection.
Active Comparator: Treatment Arm 3: VYD2311 and COVID-19 vaccine administered as 2 separate IM injections
Treatment Arm 3: VYD2311 250 mg and a COVID-19 vaccine adminstered as two IM injections in separate locations
Drug: COVID-19 mRNA vaccine
A one-time dose of COVID-19 mRNA vaccine will be administered by intramuscular injection.
Drug: VYD2311
A one-time dose of VYD2311 250mg will be administered by intramuscular injection.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Assessment of safety based on treatment emergent adverse events, injection site reactions, and hypersensitivity reactions through day 6
Time Frame: Through 6 days after dose
Through 6 days after dose
Assessment of systemic reactions solicited via e-diary through day 6
Time Frame: Through 6 days after dose
To compare the systemic reaction of VYD2311 (study drug) with a COVID-19 vaccine when administered alone or concurrently in healthy adults. E-diaries will solicit participant reported systemic reactions including vomiting, fever, diarrhea, headache, fatigue, chills, myalgia, and arthralgia.
Through 6 days after dose

Secondary Outcome Measures

Outcome Measure
Time Frame
Assessment of safety based on treatment emergent adverse events, injection site reactions, and hypersensitivity reactions through day 56
Time Frame: Through 56 days after dose
Through 56 days after dose
sVNA titers (VYD2311 serum concentration/variant IC50) against relevant SARS-CoV-2 variants through Day 56
Time Frame: Through 56 days after dose
Through 56 days after dose
Serum concentrations of VYD2311 through Day 56
Time Frame: Through 56 days after dose
Through 56 days after dose

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Invivyd, Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

June 8, 2026

Primary Completion (Estimated)

August 1, 2026

Study Completion (Estimated)

August 1, 2026

Study Registration Dates

First Submitted

June 8, 2026

First Submitted That Met QC Criteria

June 12, 2026

First Posted (Actual)

June 17, 2026

Study Record Updates

Last Update Posted (Actual)

June 17, 2026

Last Update Submitted That Met QC Criteria

June 12, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • VYD2311-PREV-003

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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