Pioneer oral streptococci produce immunoglobulin A1 protease

Abstract excerpt

As part of a longitudinal study of the relationship between bacterial colonization and the secretory immune response, 367 isolates of pioneer viridans streptococci collected from 40 breast- and bottle-fed neonates within the first month postpartum were tested for the production of immunoglobulin A1 (IgA1) protease and glycosidases. Fifty percent of the streptococci isolated produced IgA1 protease, including all...

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