Streptococcus

Streptococcus
Scientific classification
Domain: Bacteria Phylum: Firmicutes Class: Bacilli Order: Lactobacillales Family: Streptococcaceae Genus: Streptococcus

Streptococcus is a genus of spherical, Gram-positive bacteria of the phylum Firmicutes. These bacteria grow in chains or pairs, with cell division occurring only along one axis. In this sense they are contrasted with Staphylococcus, which divides along several axes, generating a "cluster" of cellss, which resemble clusters of grapes.

Members of the genus Streptococcus which cause disease include:

• Group A Streptococci (Streptococcus pyogenes) which causes Group A streptococcal infection
• Group B Streptococci (Streptococcus agalactiae) which causes meningitis in neonates and the elderly, with occasional systemic bacteremia.
• Group D Streptococci (S. durans, S. avium, S. bovis)
• Streptococcus pneumoniae which causes pneumonia
• Streptococcus viridans group which cause endocarditis and dental abscesses.