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Prototype/XBB.1.5 Bivalent Vaccine

Phase 3

COVID-19 | Monoclonal antibody | Infectious Disease |Novavax, Inc.|Last Updated: Jul 15, 2025

Success Probability

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment400

FDA Designations

No designations recorded

Clinical trial landscape

Prototype/XBB.1.5 Bivalent Vaccine · 1 trial · 1 indication

Phase 3 1
NCT05973006Phase 3 Adolescent Study for SARS-CoV-2 rS Variant VaccinesCOVID-19
COMPLETED400 Analytics
PHASE3COMPLETED
Phase 3 Adolescent Study for SARS-CoV-2 rS Variant Vaccines
COVID-19Unlock trial analytics

Study Endpoints

Primary Endpoints

Participants With Solicited Local and Systemic AEs for 7 Days Following Vaccination
Day 7

Participants with solicited local and systemic adverse events (AEs) To assess the overall safety of 1 heterologous booster dose of NVX CoV2601 and the bivalent vaccine (NVX CoV2373 + NVX-CoV2601) for 7 days following vaccination

Participants With Unsolicited AEs Through 28 Days After Vaccination
Day 28

Participants with unsolicited AEs to assess the overall safety of 1 heterologous booster dose of NVX CoV2601 and the bivalent vaccine (NVX CoV2373 + NVX-CoV2601) through 28 days after vaccination.

Participants With (MAAEs) Attributed to Study Vaccine, (AESIs) (PIMMCs), Myocarditis and/or Pericarditis, and Complications Specific to COVID-19), and Serious Adverse Events (SAEs)
Day 180

Participants with medically attended adverse events (MAAEs) attributed to study vaccine, adverse events of special interest (AESIs) (predefined list including potential immune-mediated medical conditions (PIMMCs), myocarditis and/or pericarditis, and complications specific to COVID-19), and serious adverse events (SAEs) o assess the overall safety of 1 heterologous booster dose of NVX CoV2601 and the bivalent vaccine (NVX CoV2373 + NVX-CoV2601)through day 180 or end of study (EOS).

Immunogenicity Index- Neutralizing Antibody (NAb) Expressed as Geometric Mean Titers (GMTs) to the Omicron XBB.1.5 Strain.
Day 0 and Day 28

The neutralizing antibody (NAb) response induced by NVX CoV2601 and the bivalent vaccine (NVX CoV2373 + NVX-CoV2601) against the Omicron XBB.1.5 strain assessed at Day 28 following initial study vaccination.

Immunogenicity Index- The Neutralizing Antibody (NAb) Expressed as Geometric Mean Fold Rise (GMFR) to the Omicron XBB.1.5 Strain.
Day 28

the neutralizing antibody (NAb) response induced by NVX CoV2601 and the bivalent vaccine (NVX CoV2373 + NVX-CoV2601) against the Omicron XBB.1.5 strain, assessed at Day 28

Secondary Endpoints

Neutralizing Antibody (NAb) Expressed as Geometric Mean Titers (GMTs) to the Omicron XBB.1.5 Strain.
Day 0 to Day 180
Neutralizing Antibody (NAb) Expressed as Geometric Mean Fold Rise (GMFR) to the Omicron XBB.1.5 Strain.
Day 28 to Day 180
IgG Geometric Mean ELISA (Enzyme-linked Immunosorbent Assay) Units (GMEUs) to the Omicron XBB.1.5 S Protein.
Day 0 to Day 180
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Group-A NVX-CoV2601EXPERIMENTALThe Monovalent NVX-CoV2601 of 5 μg of antigen with 50 μg of Matrix-M adjuvant
Group-B Bivalent NVX CoV2373 + NVX CoV2601ACTIVE_COMPARATORThe Bivalent NVX CoV2373 + NVX CoV2601 of 5 μg of each antigen with a total of 50 μg of Matrix-M adjuvant

Interventions

NameTypeDescription
NVX-CoV2601 co-formulated Omicron XBB.1.5 SARS-CoV-2 rS vaccineBIOLOGICALCoformulated Omicron XBB.1.5 SARS-CoV-2 rS vaccine with Matrix-M adjuvant: supplied as a solution for preparation for injection, at a concentration of 10 µg antigen and 100 µg adjuvant per mL. All injections will be administered in a 0.5 mL injection volume at a dose of 5 µg antigen with 50 µg Matrix-M adjuvant.
Prototype/XBB.1.5 Bivalent Vaccine (5 µg)BIOLOGICALA site-mixed bivalent vaccine prepared by combining 0.25 mL of NVX-CoV2373 and 0.25 mL NVX-CoV2601. All injections will be administered in a 0.5 mL injection volume at a dose of 5 µg total antigen (2.5 µg prototype antigen + 2.5 µg Omicron XBB.1.5 antigen) with 50 µg Matrix-M adjuvant.
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Eligibility Criteria

Age Range11 Years to 18 Years
SexALL
Healthy VolunteersYes
Study Sites20

Inclusion Criteria: 1. Adolescents ≥ 12 to \< 18 years of age at screening 2. Participant and parent(s)/caregiver(s) or legally acceptable representative willing and able to give in-formed consent and assent, as required, prior to study enrollment and to comply with study procedures. 3. Participant...

Countries:United States
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Frequently asked questions about Prototype/XBB.1.5 Bivalent Vaccine

What is Prototype/XBB.1.5 Bivalent Vaccine used for?

Prototype/XBB.1.5 Bivalent Vaccine is an investigational vaccine being developed for the prevention of COVID-19. It is currently in Phase 3 clinical development and has not been approved by regulatory authorities. The vaccine is designed to target SARS-CoV-2, the virus that causes COVID-19.

Who makes Prototype/XBB.1.5 Bivalent Vaccine?

Prototype/XBB.1.5 Bivalent Vaccine is being developed by Novavax, Inc. (NASDAQ: NVAX). The company is conducting clinical trials to evaluate the vaccine's safety and efficacy in preventing COVID-19.

What phase is Prototype/XBB.1.5 Bivalent Vaccine in?

Prototype/XBB.1.5 Bivalent Vaccine is in Phase 3 clinical development. It is an investigational vaccine and has not yet been approved for use. A Phase 3 clinical trial has been completed to evaluate its safety and immunogenicity in adolescents.

What clinical trials is Prototype/XBB.1.5 Bivalent Vaccine in?

Prototype/XBB.1.5 Bivalent Vaccine has been studied in one completed Phase 3 clinical trial, NCT05973006, titled 'Phase 3 Adolescent Study for SARS-CoV-2 rS Variant Vaccines'. The trial enrolled 400 participants in the United States and evaluated the vaccine in healthy volunteers aged 11 years and older.

How does Prototype/XBB.1.5 Bivalent Vaccine work?

Prototype/XBB.1.5 Bivalent Vaccine is a recombinant protein vaccine that targets the SARS-CoV-2 virus. It is designed to elicit an immune response against the virus, potentially providing protection against COVID-19. The vaccine is being evaluated for its ability to generate neutralizing antibodies.