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11 Cards in this Set
- Front
- Back
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Classification |
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S. Pyogenes |
Beta hemolytic, Group A Longest chain: S.salivarius Bacitracin sensitive PYR positive Ribose not fermented |
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Culture |
Require carbs with blood/serum 10% CO2 promotes |
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Serological grouping |
Todd Hewitt Broth, Ag extracted using Lancefield method: HCl Fuller: formamide Maxted: Streptomyces albus enzyme Rantz, Randall: autoclave Agar gel pptn |
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Virulence factors |
Polysaccharide capsule: anti phagocytic, colonization-biofilm, weak antigen Cell wall: inside to out-- peptidoglycan, carb, lipoteichoic acid & MTR protein Fimbria |
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Hemolysin |
O: oxygen labile, cardiotoxic S: stable, non antigenic |
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Pyrogenic exotoxin |
Scarlatinal toxin Super antigen Dick test, Schultz Charlton rxn Type A mc |
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Toxins |
Streptokinase, hyaluronidase: spread Streptodornase: serous fluid Spy Lep: inactivate IL-8 |
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Infections |
Pharyngitis: MC Scarlet fever: sandpaper skin, strawberry tongue, circumoral pallor, HS rxn to toxin Impetigo: face and leg Cellulitis: MC org, also Clostr, E.coli, staph Erysipelas: peau d'orange, cheek Necrotizing fasciitis Peurperal sepsis |
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PYR test |
Positive: S.pyogenes, enterococcus Negative: S.anginosus |
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Bacitracin |
Sensitive: pyogenes Resistant: anginosus, agalactiae (group B) |
