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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.
Streptococcus pyogenes, also known as the flesh eating bacteria, is the most pathogenic bacterium in the whole genus (2).The name pyogenes comes from the word pyogenic, which is a classification for the streptococci that are associated with pus formation.The effects of this microbe range from mild illnesses such as strep throat and impetigo to more serious diseases such as scarlet fever, glomerulonephritis, and necrotizing fasciitis (3).treptococcus pyogenes, also known as the flesh eating bacteria, is the most pathogenic bacterium in the whole genus (2).