Streptococcus pyogeness
Infections and Diseases
Strep throat (pharyngitis)
Scarlet fever
Erysipelas
Impetigo
Cellulitis
Necrotizing fasciitis (flesh-eating disease)
Streptococcal toxic shock syndrome (STSS)
Rheumatic fever
Post-streptococcal glomerulonephritis
Morphological Details
Cocci (spherical)
Forms chains
Gram-positive
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Identifiable Physical Features
Round, smooth, domed colonies
Small, 0.5–1.0 mm in diameter
Translucent to opaque
Off-white, gray, or yellowish in color
Mucoid in encapsulated strains
Due to hyaluronic acid capsule
Additional Facts
Generally sensitive to penicillin, but
resistance to macrolides (erythromycin)
is rising
Known for its M protein and role in
autoimmune sequelae
A key organism in studying immune
evasion and virulence mechanisms
Also known as Group A Streptococcus
(GAS) or Group A (beta-hemolytic
Streptococcus (GABHS).
