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Game plan
Lecture Case Studies: Skin and eye diseases
Lab Major Unknown Major Unknown Quiz
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Skin- first line of defense
• Structural:
Epidermal and dermal layers Stratum corneum contains keratin • Physical and chemical defense factors
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Lacrimal apparatus- first line of defense
• Physical and chemical defense factors
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Skin/Eye Lesions
- Causes:
- Direct penetration of pathogen
- Hematogenous spread of pathogen to site
- Cutaneous manifestations of systemic diseases
- Classified by anatomical level of infection
- Superficial
- Deep (necrotizing fasciitis)
- Lesion type important for diagnosis
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Lesions
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Staphylococcal infections
- Clinically divided by coagulase positive or negative
- Characteristics of coagulase-positive S. aureus:
- Can survive for months on solid surface - Produces toxins: hemolysins, enterotoxins, superantigens - Blocks chemotaxis of neutrophils - Produces toxins that kill neutrophils - Resistant to opsonization - Resistant to lysozyme - Human antibodies unable to prevent multiple infections
- Can causes folliculitis, sty, abscess, impetigo, bullous
impetigo and scalded skin syndrome
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Staphylococcal infections- scalded skin syndrome
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Streptococcal infections
- Clinically divided by hemolytic ability
- Characteristics of b-hemolytic S. pyogenes:
- 80 immunological subtypes that vary by M protein - M protein prevents activation of complement (and thus downstream
effects) - Contains streptokinases, hyaluronidases, deoxyribonucleases,
streptolysins
- Can cause strep throat, leading to erysipelas, and necrotizing
fasciitis (“flesh-eating” bacteria) due to exotoxin A
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Streptococcal infections- erysipelas and impetigo
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Invasive Group A Streptococcal (GAS) Infections
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Pseudomonas aeruginosa infection and infectious granuloma
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Papillomavirus spp- dermal warts
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Papillomavirus spp- A little something different
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Variola virus- smallpox
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Varicella zoster virus- chickenpox and shingles
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Measles (Rubeola)
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Tinea infections- cutaneous mycoses
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Blastomycoses dermatitidis- subcutaneous mycoses
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Candidiasis
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Candidiasis
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Soil organisms (Madurella and actinomycetes)- Madura foot or Eumycetoma
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Sarcoptes scabiei- Scabies
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Chlamydia trachoma- trachoma