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The most. significant pathogens are Streptococcus pyogenes (Lancefield Group A), Streptococcus. agalactiae (Lancefield Group B) a nd Streptococcus pneumoniae. Some streptococci (fo rmerly. group D) n ow placed in the genus Enterococcus are of medical significance because they are.
Another study that has been done was between the species Streptococcus pneumoniae and Streptococcus pyogenes. The study involved exploring the relationship of erythromycin resistance between the two species in different hospitals in Spain.