title: Comparative analysis of pathogenicity factors of closely related Mitis group streptococci and surface protein-containing antigens isolated from them
abstract: Relevance . Mitis group streptococci (SMG) include 9 species of streptococci most frequently isolated from patients, including Streptococcus oralis and Streptococcus pneumoniae. The study of SMG shows not only differences but also overlaps in the genes encoding pathogenicity factors of S. pneumoniae and S. oralis. Earlier it was shown that antigens from S. pneumoniae serotype 6B induced cross-protective effect against virulent strains of S. pneumoniae. It was found that the experimental surface 
journal: Epidemiology and Vaccinal Prevention