CLLS 124: Strep
Terms
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Identify this catalase negative, gpc:
Gamma hemolytic
BE: negative
6.5% NaCl: negative - Streptococcus viridans group
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Identify this catalase negative, gpc:
Beta hemolytic
BE: negative
Bacitracin: positive
CAMP: negative - Beta-Streptococcus Group A (S. pyogenes)
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Identify this catalase negative, gpc:
Alpha hemolytic
BE: positive
6.5% NaCl: negative - Streptococcus Group D, non-Enterococcus
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Identify this catalase negative, gpc:
Beta hemolytic
BE: negative
Bacitracin: negative
Hippurate hydrolysis: negative - Beta-Streptococcus not group A, B, or D
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Identify this catalase negative, gpc:
Gamma hemolytic
BE: positive
6.5% NaCl: positive - Enterococcus
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Identify this catalase negative, gpc:
Alpha hemolytic
BE: negative
Optochin: positive - Streptococcus pneumoniae
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Identify this catalase negative, gpc:
Beta-hemolytic
BE: negative
PYR: positive
CAMP: negative - Beta-Streptococcus Group A (S. pyogenes)
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Identify this catalase negative, gpc:
Beta-hemolytic
BE: negative
Bacitracin: negative
Hippurate hydrolysis: positive - Beta-hemolytic Streptococcus Group B (S. agalactiae)
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Identify this catalase negative, gpc:
Alpha hemolytic
BE: negative
PYR: negative
Bile solubility: negative - Streptococcus viridans group
- Which of the Streptococci usually has an alpha-hemolytic, mucoid colony?
- Streptococcus pneumoniae
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For Streptococcus viridans group:
a. where is it usually found as normal flora?
b. when found as a pathogen, what disease does it usually cause? -
a. mucus membranes -- mouth and vagina
b. SBE -
For Streptococcus pneumoniae:
a. Where is it found as normal flora?
b. Which diseases does it usually cause? -
a. small numbers in oral cavity
b. lobar pneumonia, meningitis, otitis media, sinusitis -
For Enterococcus:
a. Where is it found as normal flora?
b. Where does it usually cause disease? -
a. intestine
b. urinary tract, wounds, bloodstream -
For Beta-hemolytic Streptococcus Group A:
a. Where is it found as normal flora?
b. What diseases does it cause? -
a. small numbers in oral cavity
b. Strep throat, scarlet fever, impetigo, erysipelas, toxic shock-like syndrome, wound infections, necrotizing fasciitis -
For Beta-hemolytic Streptococcus Group B:
a. Where can it be found as normal flora?
b. What types of disease does it usually cause? -
a. small numbers in oral cavity or vagina
b. neonatal infections: meningitis, bacteremia, or respiratory distress syndrome