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RBD SARS-CoV-2 HBsAg VLP vaccine
- Development stage
- Discontinued
- Lead developer
- Serum Institute of India
- Modality
- Recombinant Proteins and Enzymes, Vaccines & Immunotherapeutics
- Administration
- Intramuscular
01
Overview
The RBD SARS-CoV-2 HBsAg VLP vaccine (also referred to as COVIVAXX) is an investigational recombinant virus-like particle (VLP) subunit vaccine developed by Accelagen in collaboration with SpyBiotech and the Serum Institute of India for the prevention of COVID-19. The vaccine's active ingredient consists of the SARS-CoV-2 receptor-binding domain (RBD) antigen covalently conjugated to hepatitis B surface antigen (HBsAg) virus-like particles (VLPs) using SpyBiotech's proprietary SpyTag/SpyCatcher transpeptidation system. This "superglue" technology allows for high-density, repetitive display of the RBD antigen on the surface of the HBsAg VLP scaffold, mimicking the viral structure to enhance immunogenicity and stimulate the production of neutralizing anti-RBD antibodies. Formulated with adjuvants such as alum alone or alum combined with CpG 1018, the vaccine is administered intramuscularly. It has been evaluated in Phase 1/2 clinical trials in Australia, though development was stopped early for commercial reasons.
- Brand names
- COVIVAXX
- Other names
- RBD-HBsAg VLP vaccineRBD-VLP vaccine
02
Targets
ACE2 (Angiotensin-converting enzyme 2)B-cell receptor specific for SARS-CoV-2 receptor-binding domain
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