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COVID-19 mRNA vaccine

Phase 3

COVID-19 | Small molecule | Infectious Disease |Invivyd, Inc.|Last Updated: Jun 17, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLED
Total Trials1
Total Enrollment210

FDA Designations

No designations recorded

Clinical trial landscape

COVID-19 mRNA vaccine · 1 trial · 1 indication

Phase 3 1
NCT07655180Safety and Serum Virus Neutralizing Antibody Responses of VYD2311, a COVID-19 Vaccine, and Coadministered VYD2311 With a COVID-19 VaccineCOVID-19
RECRUITING210 Analytics
PHASE3RECRUITING
Safety and Serum Virus Neutralizing Antibody Responses of VYD2311, a COVID-19 Vaccine, and Coadministered VYD2311 With a COVID-19 Vaccine
COVID-19Unlock trial analytics

Study Endpoints

Primary Endpoints

Assessment of safety based on treatment emergent adverse events, injection site reactions, and hypersensitivity reactions through day 6
Through 6 days after dose
Assessment of systemic reactions solicited via e-diary through day 6
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.

Secondary Endpoints

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

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Treatment Arm 1: A COVID-19 vaccine and Placebo administered as 2 separate IM injectionsACTIVE_COMPARATORTreatment Arm 1: A COVID-19 vaccine administered by IM injection and placebo administered by IM injection in separate locations
Treatment Arm 2: VYD2311 and Placebo administered as 2 separate IM injectionsACTIVE_COMPARATORTreatment Arm 2: VYD2311 250 mg administered by IM injection and placebo administered by IM injection in separate locations
Treatment Arm 3: VYD2311 and COVID-19 vaccine administered as 2 separate IM injectionsACTIVE_COMPARATORTreatment Arm 3: VYD2311 250 mg and a COVID-19 vaccine adminstered as two IM injections in separate locations

Interventions

NameTypeDescription
COVID-19 mRNA vaccineDRUGA one-time dose of COVID-19 mRNA vaccine will be administered by intramuscular injection.
VYD2311DRUGA one-time dose of VYD2311 250mg will be administered by intramuscular injection.
Placebo (Normal Saline)DRUGA one-time dose of normal saline (placebo) administered by intramuscular injection.
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Eligibility Criteria

Age Range18 Years to 49 Years
SexALL
Healthy VolunteersYes
Study Sites1

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 Investigat...

Countries:United States
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Recent Changes (Last 90 Days)

LOWJun 18, 2026NCT07655180NEW_TRIAL: changed
LOWJun 18, 2026NCT07655180NEW_TRIAL: changed
LOWJun 18, 2026NCT07655180NEW_TRIAL: changed
LOWJun 18, 2026NCT07655180NEW_TRIAL: changed

Frequently asked questions about COVID-19 mRNA vaccine

What is VYD2311 used for?

VYD2311 is an investigational COVID-19 mRNA vaccine being developed for the prevention of COVID-19. It is currently in Phase 3 clinical development and is not yet approved by regulatory authorities. The vaccine is designed to elicit serum virus neutralizing antibody responses against COVID-19.

Who is developing VYD2311?

VYD2311 is being developed by Invivyd, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol IVVD. The company is conducting a Phase 3 clinical trial to evaluate the safety and immunogenicity of VYD2311 as a COVID-19 vaccine.

What phase is VYD2311 in?

VYD2311 is currently in Phase 3 clinical development. It is an investigational COVID-19 vaccine and has not been approved by the FDA or any other regulatory authority. The ongoing Phase 3 trial is actively recruiting participants in the United States.

What clinical trials is VYD2311 in?

VYD2311 is being evaluated in a Phase 3 clinical trial registered as NCT07655180. This randomized, double-blind, active-controlled study is assessing the safety and serum virus neutralizing antibody responses of VYD2311, both alone and coadministered with another COVID-19 vaccine. The trial is recruiting 210 healthy adult participants aged 18 years and older in the United States.

Is VYD2311 the same as the COVID-19 mRNA vaccine?

VYD2311 is a specific COVID-19 mRNA vaccine candidate developed by Invivyd, Inc. It is distinct from other mRNA vaccines, such as those from Pfizer-BioNTech or Moderna. VYD2311 is being studied as a standalone vaccine and in combination with another COVID-19 vaccine in a Phase 3 trial.