has role protective antigen role protective antigen Streptococcus pneumoniae protein PsaA Allen Xiang protein Vaccination with an RASV synthesizing full-length PsaA induced high titers of anti-PsaA antibodies in both systemic (IgG in serum) and mucosal (IgA in vaginal washes, nasal washes, and lung homogenates) sites. BALB/c (haplotype H2(d)) or C57BL/6 (haplotype H2(b)) mice vaccinated either orally or intranasally exhibited a significant reduction in colonization of nasopharyngeal tissues after intranasal challenge with S. pneumoniae strains compared to controls, although protection was not observed with all challenge strains. None of the vaccine constructs provided protection against intraperitoneal challenge with S. pneumoniae strain WU2 (serotype 3) [PubMed: 20479086]. Protegen ID: 605; NCBI Protein GI: 209867628; NCBITaxon: 1313 Oliver He