Opsonic Activity of Conservative Versus Variable Regions of the Group A Streptococcus M Protein.

ABSTRACT: Group A Streptococcus (GAS) and GAS-associated infections are a global challenge, with no licensed GAS vaccine on the market. The GAS M protein is a critical virulence factor in the fight against GAS infection, and it has been a primary target for GAS vaccine development. Measuring functional opsonic antibodies against GAS is an important component in the clinical development path for effective vaccines. In this study, we compared the opsonic activity of two synthetic, self-adjuvanting subunit vaccines containing either the J8- or 88/30-epitope in Swiss outbred mice using intranasal administration. Following primary immunization and three boosts, sera were assessed for IgG activity using ELISA, and opsonization activity against seven randomly selected clinical isolates of GAS was measured.

SUBMITTER: Dai C 

PROVIDER: S-EPMC7349123 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature