GENOMIC RELATEDNESS AMONG REFERENCE STRAINS OF DIFFERENT STREPTOCOCCUS-SUIS SEROTYPES

Hybridization studies using genomic DNA and a rDNA probe revealed gene tic relatedness among reference strains of different Streptococcus sui s serotypes. Although most serotype 22 isolates are biochemically atyp ical, the reference strain of capsular type 22 is genetically related to other S. suis serotypes, but not to Streptococcus pneumoniae. Using DNA digested with BamHI and BglII for ribotyping, some S. suis refere nce strains had common patterns, but this analysis mainly revealed var iations in patterns of S. suis strains of different serotypes.