[Genetic analysis of pathogenic streptococci groups A and B].

The study deals with the genetic mapping of chromosomal DNA of groups A (AS) and B (BS) pathogenetic Streptococci. Its stages are presented and considered. The maps of these microorganisms are compared. A collection of epidemic AS and BS was analyzed by employing pulsed field gel electrophoresis. AS and BS were found to show heterogeneity of DNA sequences and the common pattern of gene location on the chromosomes.