NCIt definition : A species of Gram positive, cocci shaped bacteria assigned to the phylum Firmicutes.
This species is catalase and pyrase negative, nonsporulating, leucine aminopeptidase
positive, does not hydrolyze esculin and may appear gram variable due to the ease
at which it decolorizes during the gram stain. H. pyogenes is an emerging pathogen.;
Alternative definition : CDISC: Any bacterial organism that can be assigned to the species Helcococcus pyogenes.;