Streptococcus

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Author:
ucstudent01
ID:
219369
Filename:
Streptococcus
Updated:
2013-05-16 18:18:14
Tags:
Streptococcus
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Description:
Strep
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  1. Media and growth requirements for all strep
    • Facultative anaerobe
    • Requires Enriched media
  2. Group A : S. pyogenes gram stain & colony discription
    • Pinpoint 
    • Grayish white
    • Translucent
    • Usually beta with a wide zone
  3. Pathogenicity for A
    • Causes 90% of strep infections
    • rheumatic fever
    • scarlet fever
    • erysipelas
    • sepsis
    • impetigo
    • glomerulonephritis
  4. Biochemical tests for A
    • Postive:
    • *PYR
    • Negative:
    • Catalase
    • Susceptible to *bacitracin & Most penicillin
    • Resistant to SXT
  5. Group B : S. agalactiae gram stain & colony description.
    GPC in chains

    • Slightly larger colonies than A. 
    • Semi-opaque
    • Bull's eye 
    • Diffuse beta hemolysis with narrow zone
    • Occasionally nonhemolytic
  6. Pathogenicity for B
    Normal flora of femal genital tact.

    Most common cause of neonatal septicemia and meningitis
  7. Indentification tests for B
    • Positive:
    • CAMP
    • Sodium hippurate

    • Negative:
    • Catatlase

    Resistant to: SXT & Bacitracin

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