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micro ch 21
term | Definition |
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Staphylococcal Skin Infections | a) Staphylococci are gram positive bacteria that grow in clusters. b) The majority of skin microbiota are coagulase negative S. epidermidis. c) Almost all pathogenic strains of S. aureus produce coagulase. |
Staphylococcal Skin Infections | d) S. aureus can produce enterotoxin and, leukocidins. Toxemia occurs when toxins enter the blood stream as with exfoliative toxin and toxic shock toxin causing toxic shock syndrome. |
Staphylococcal Skin Infections | e) Many strains of S. aureus produce penicillinase and may be treated with vancomycin. f) Staph impetigo of the newborn is a highly contagious superficial skin infection. |
Streptococcal Skin Infections | a) Streptococci are gram positive cocci that often grow in chains and are aerotolerant anaerobes. b) Streptococci are classified according to their hemolysins and serologic antigenic carbohydrates |
Streptococcal Skin Infections | c) Group A β-hemolytic Strep pyogenes are the pathogens most important to humans. d) Group A produces a number of virulence factors: M protein, erythrogenic toxin , deoxyribonuclease, streptokinase, hyaluronidase. |
Streptococcal Skin Infections | e) Erysipelis and impetigo are commonly caused by S. pyogenes. f) Invasive S. pyogenes cause severe and rapid skin destruction myositis, necrotizing fasciitis, flesh-eating). |