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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.
A group A streptococcal infection is an infection with group A streptococcus (GAS), that is, Streptococcus pyogenes, the sole species constituting Lancefield group A. This beta-hemolytic species of bacteria is responsible for a wide range of both invasive and noninvasive infections. group A streptococcal infection is an infection with group A streptococcus (GAS), that is, Streptococcus pyogenes, the sole species constituting Lancefield group A. This beta-hemolytic species of bacteria is responsible for a wide range of both invasive and noninvasive infections.