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Pathogens
Streptococcus pyogenes, Group A

Streptococcus pyogenes, Group A

Susceptibilities

General susceptibility
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General Information

  • Penicillin
  • Cefazolin
  • Toxic shock or necrotizing infection: add clindamycin
  • Vancomycin
  • Linezolid

Gram positive cocci in chains, beta-hemolytic

  • Reservoir is human skin and oropharynx/mucous membranes
  • Person-to-person transmission

Most common manifestations:

  • Pharyngitis ("Strep throat")
  • Skin infections (impetigo, erysipelas, cellulitis)

Other invasive infections:

  • Bacteremia
  • Endocarditis
  • Necrotizing fasciitis

  • Toxic shock syndrome

  • Post-infectious immunologically mediated phenomena such as glomerulonephritis and rheumatic fever