tokens: The human pathogenic bacterium group A Streptococcus produces an extracellular cysteine protease [ streptococcal pyrogenic exotoxin B ( SpeB ) ] that is a critical virulence factor for invasive disease episodes .
folded_tokens: the human pathogenic bacterium group a streptococcus produce a extracellular cysteine protease [ streptococcal pyrogenic exotoxin b ( speb ) ] that be a critical virulence factor for invasive disease episode .