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24 Cards in this Set
- Front
- Back
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What are the different morphology of bacteria that you can see on a gram stain?
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Rods
Branching filaments Cocci |
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What are the gram positive bacteria that have a branching filament morphology?
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Actinomyces
Nocardia |
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How do you differentiate between nocardia and actinomyces?
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Nocardia: Aerobe; acid fast
Actinomyces: Anaerobe; not acid fast |
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Which of the branching filament gram positive bacteria is acid fast? Anaerobic?
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Acid fast: Nocardia
Anaerobe: Actinomyces |
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What are the gram positive rods?
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Clostridium
Corynebacterium Listeria Bacillus Mycobacterium |
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Which of the gram positive rods is an:
Anaerobe? Aerobe? Acid fast? |
Anaerobe: Clostridium
Aerobe: bacillus Acid fast: mycobacterium |
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How do you differentiate between the gram positive cocci?
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Catalase!
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What gram positive cocci are catalase positive? Catalase negative?
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Catalase positive: Staphylococcus
Catalase negative: streptococcus |
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What's the morphology of Streptococcus on culture?
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Chains
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What's the morphology of staphylococcus on culture?
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Clusters
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What are the coagulase positive staphylococcus?
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S. aureus
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What are the coagulase negative staph?
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S. epidermidis
S. saprophyticus |
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How do you differentiate between the coagulase negative staph?
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Novobiocin:
S. epidermidis: sensitive S. saprophyticus: resistant |
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How do you differentiate between the catalase negative, gram positive cocci?
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Hemolysis patterns?
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What are the different hemolysis patterns?
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Alpha: partial hemolysis (green)
Beta: complete hemolysis (clear) No hemolysis |
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What kinds of strep are considered alpha hemolyzers?
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S. pneumoniae
Viridans streptococci |
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How do you differentiate between the gram positive, catalase negative, alpha hemolyzing cocci?
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Optochin!
Sensisitve: S. pneumoniae Resistant: viridans |
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Which of the gram positive, catalase negative, alpha hemolyzing cocci has a capsule? Which doesnt?
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S. pneumoniae: capsule
Viridans: no capsule |
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What are the different kinds of Beta hemolyzing strep?
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Group A
Group B |
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What are the characteritics of the beta hemolyzing, Group A strep?
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Bacitarcin sensitive
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Which bacteria belong to the beta hemolyzing, Group A strep?
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S. pyogenes
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Which bacteria belong to the beta hemolyzing, Group B strep?
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S. agalacitae
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What are the different kinds of catalase negative bacteria that don't hemolyze (gamma hemolysis)?
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Enterococcus
Nonenterococcus |
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How do you differentiate between the catalase negative, gamma hemolyzing gram positive bacteria?
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Both grow in bile
Enterococcus grows in 6.5% NaCl S. bovis doesn't grow in 6.5% NaCl |
