Streptococcus is genus that gives a positive result in the Gram stain test.
Gram-positive bacteria are bacteria that give a positive result in the Gram stain test , which is traditionally used to quickly classify bacteria into two broad categories according to their cell wall . Streptococcus is a genus of coccus ( spherical ) Gram-positive bacteria belonging to the phylum Firmicutes and the order Lactobacillales ( lactic acid bacteria ) .