An Advax-CpG55.2™ adjuvanted recombinant spike protein vaccine protects cynomolgus macaques from a homologous SARS-CoV-2 virus challenge.

ABSTRACT: Traditional protein-based vaccine approaches to COVID-19 were overshadowed by the new mRNA and adenoviral vector vaccine approaches which were first to receive marketing authorization. The current study tested for the first time in repurposed aged (median 15.4 years) cynomolgus macaques, a novel Advax-CpG55.2™ adjuvanted recombinant extracellular domain spike protein trimer antigen for immunogenicity, protection and safety. Nine animals received two intramuscular injections 10 days apart of recombinant spike protein (25 μg) with Advax-CpG55.2™ (10 mg/200 μg) and 5 controls received saline injections. Serum antibody levels were followed for 3 months and then the animals were challenged with SARS-CoV-2 virus. Clinical signs, local reactions, body weight, food consumption and antibody levels

SUBMITTER: Honda-Okubo Y 

PROVIDER: S-EPMC10277844 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature