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Streptococcus

From Biocrawler, the free encyclopedia.

Streptococcus

Scientific classification

Kingdom:	Monera
Phylum:	Firmicutes
Class:	Bacilli
Order:	Lactobacillales
Family:	Streptococcaceae
Genus:	Streptococcus

Species

S. agalactiae
S. avium
S. bovis
S. durans
S. faecalis
S. pneumoniae
S. pyogenes
S. viridans

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 cells, which resemble clusters of grapes. Though many people believe Streptococcus is a species and only causes strep throat, this is not true. The genus contains many species, most of which are pathogens, or disease causing organisms.

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), also known as GBS, which causes meningitis in neonates and the elderly, with occasional systemic bacteremia. They can also colonize the female reproductive tract, increasing the risk for premature rupture of membranes and transmission to the child. The Centers for Disease Control and Prevention (CDC) have a website dedicated to GBS: Preventing Group B Strep Disease (http://www.cdc.gov/groupbstrep/)
Group D Streptococci (S. durans, S. avium, S. bovis)
Streptococcus pneumoniae which can cause pneumonia
Streptococcus viridans group which cause endocarditis and dental abscesses.

Symptoms of Streptococcus pyogenes in adults may include a fever, sore throat, and swollen glands in the neck. Children may experience a sore throat, rash, and abdominal pain. Doctors diagnose strep throat by taking a sample of material from the back of a patient's throat and sending it to be tested for Streptoccocus pyogenes.

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