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Streptococcus
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Media and growth requirements for all strep
Facultative anaerobe
Requires Enriched media
Group A : S. pyogenes gram stain & colony discription
Pinpoint
Grayish white
Translucent
Usually beta with a wide zone
Pathogenicity for A
Causes 90% of strep infections
rheumatic fever
scarlet fever
erysipelas
sepsis
impetigo
glomerulonephritis
Biochemical tests for A
Postive:
*PYR
Negative:
Catalase
Susceptible to
*
bacitracin & Most penicillin
Resistant
to SXT
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
Pathogenicity for B
Normal flora of femal genital tact.
Most common cause of neonatal septicemia and meningitis
Indentification tests for B
Positive:
CAMP
Sodium hippurate
Negative:
Catatlase
Resistant to
: SXT & Bacitracin
Author
Kwalke12
ID
219369
Card Set
Streptococcus
Description
Strep
Updated
2013-05-16T22:18:14Z
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