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25 Cards in this Set
- Front
- Back
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Catalase -
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Strep
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Catalase -
α hemolytic Optochin Sensitive |
S. pneumoniae
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Catalase -
α hemolytic Optochin Resistant |
S. viridans
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Catalase -
ß hemolytic Bacitracin Sensitive |
S. pyogenes
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Catalase -
ß hemolytic Bacitracin Resistant |
S. agalacticae
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What does M protein do for S. pyogenes
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Found on fimbriae that interferes with phagocytosis
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Toxin causing Scarlet fever. what is unique about it.
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S. pyogenes: erythrogenic exotoxin
lysogenic phage (virus) causes the rash |
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Spreading factor in S. pyogenes
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Hyaluronidase
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Virulence factors of S. pyogenes
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Capsule
Hyaluronidase M protein |
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Catalase (+)
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Staph
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Catalase (+)
Coagulase (+) ß Hemolytic |
S. aureus
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Catalase (+)
Coagulase (-) No Hemolytic Novobiacin Sensitive |
S. epidermidis
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Catalase (+)
Coagulase (-) No Hemolytic Novobiacin resistant |
S. saprophyticus
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Virulence factors of S. aureus
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Coagulase
Capsule Teichoic Acid Protein A Fibronectin-binding protein Collagen-binding protein Biofilm |
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Most common cause of surgical infections and why
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S. aureus due to biofilm
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How does Protein A work
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Binds to the Fc region of IgG Ab preventing Ag binding
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Why is MRSA resistant
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Mutation of Penicillin Binding Protein (PBP)
or carry mecA gene |
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CA-MRSA vs HA-MRSA
More Virulent: Healthcare risks: Susceptible to other anti-microbials: |
More virulent: CA-MRSA
Heathcare risks: None with CA-MRSA Abx Susceptibility: CA tends to be more susceptible to alternatives than HA-MRSA |
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Clostridium perfringens
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Gram (+) bacilli
Anaerobic ; non-motile Spore forming |
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Toxins produced by C. perfringens
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alpha exotoxin--hydrolyzes cell membrane
Phospholipase Hemolysins Collagenase |
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DOC:
MSSA |
PARP
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DOC:
CA MRSA |
Clindamycin;
Doxy; TMP/SMX |
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DOC:
HA MRSA |
Vanc +/- Gent +/- Rif
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DOC:
S. pyogenes |
1º --Pen
2º --Macrolide |
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DOC:
C. perfringens |
1º--Pen,
Clin |
