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SII B.1.351

Vaccine (Recombinant protein vaccine) · Immune activation, directed at SARS-CoV-2 spike protein · developed by Novavax

Phase 1/2 Most advanced trial (none active)

NVAX Developer

1 Registered trials

What is SII B.1.351?

SII B.1.351 is a monovalent protein subunit vaccine containing the spike protein of the SARS-CoV-2 Beta (B.1.351) variant, formulated with Matrix-M1 adjuvant. It is administered as intramuscular injections in doses ranging from 3 to 10 μg, studied in COVID-19 prevention.

Summary written with AI from the sources listed at the end of this page.

At a glance

Drug type: Vaccine (Recombinant protein vaccine)
Targets: SARS-CoV-2 spike protein (antigen)
Mechanism: Immune activation, directed at SARS-CoV-2 spike protein
Pathways: immune_activation
Therapy area: Infectious disease
Developer: Novavax (NVAX)
FDA status: Investigational, not approved in the US. Most advanced trial: Phase 1/2

🧪 Clinical trials

Trial	Phase	Condition	Status	Sponsor
NCT05029856	Phase 1/2	Covid19	Withdrawn	NVAX

Trials of the companies BioRadar tracks, from ClinicalTrials.gov, most advanced phase first.

Conditions studied

Covid19

More from Novavax

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Sources

Updated Oct 3, 2026. Something wrong or missing? Report it on the NVAX page.

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Data: FDA (Drugs@FDA, Purple Book, DailyMed), NIH (NCI Thesaurus, GSRS, RxNorm), ClinicalTrials.gov • Informational purposes only, not medical or investment advice. • All drugs A–Z