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10 Cards in this Set
- Front
- Back
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What are the 3 major groups of microorganisms making up the normal flora on the skin?
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Diphtheroids, Staphylococci, and Yeasts
Opportunistic pathogens |
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Diphthroids
NORMAL FLORA |
Variably shaped, non-motile
Gram-positive, low virulence Corynebacterium and Propionibacterium genera Non-toxin producers Common diphthroid: Propionibacterium acnes |
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Staphylococci
NORMAL FLORA |
Gram-positive cocci arranged in clusters.
Coagulase negative Facultatively anaerobic Salt tolerant Principle species: Staphylococcus epidermis |
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Fungi
NORMAL FLORA |
Malassezia genus
Require oily substances to grow (lipophillic) Can cause skin conditions such as rash, dandruff, or tinea versicolor. More common in older people. |
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Most hair follicle infections are caused by:
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Staphylococcus aureus
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S. aureus
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Gram-positive cocci (spherical)
Aerobic |
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Virulence factors of S. aureus:
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-Capsule: prevents phagocytosis
-Clumping factor: attaches the bacteria to fibrin, fibrinogen, and plastic devices -Coagulase: blocks WBCs from coming to site by producing clots -Hyaluronidase: breaks down hyaluronic acid component of tissue - promotes extension of infection -Lipases: breaks down fats -Proteases: degrades collagens and other tissue proteins -Protein A: binds to Fc portion of antibody - inhibits phagocytosis |
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Bacteria that causes SSSS
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S. aureus
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Streptococcal impetigo
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Caused by streptococcus pyogenes
Sometimes by S. aureus |
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Streptococcus pyogenes
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Gram-positive, beta-hemolytic cocci
Group A (Group A cell wall polysaccharide) |
