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28 Cards in this Set
- Front
- Back
MC cause of pyodermal skin infections: |
staph. aureus & strep. pyogenes
(non-resident flora of normal skin except in ant. nares (s. aureus )) |
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MC superficial bacterial infection in children
*highly contagious |
Impetigo |
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Bullous Impetigo is caused by _________ |
S. aureus |
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Non-bullous Impetigo is caused by __________ |
S. aureus > S. pyogenes |
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____________ primarily occurs in children (<6), but when it occurs in adults it has >50% mortality |
Staphylococcal Scalded Skin Syndrome (SSSS) |
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What causes the blisters to form in SSSS? |
exfoliatoxins A & B (ET-A & ET-B) from Staph Aureus |
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__________ skin infection of the dermis caused by Strep. pyogenes. |
Erysipelas |
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MC cause of folliculitis __________ |
S. aureus
(pseudomonas aeruginosa also common, esp from whirlpools) |
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In ______________ , monomorphic pustules are seen 1-3 days after exposure to contaminated water |
Hot tub folliculitis (p. aeruginosa) |
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___________ is deep folliculitis, pustules surrounded by halo of erythema & caused by shaving |
Sycosis Barbae (beard area folliculitis)
(staphylococcus infection) |
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How does psuedofolliculitis barbae differ from sycosis barbae?
Tx: |
caused by ingrown hairs--> created foreign body rxn (not an infection)
Tx: benzoyl peroxide + clindoamycin |
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Diff btwn abscess & furuncle? (BOTH contain pus) |
furuncle involves a hair follicle
*carbuncle = collection of furuncles |
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What gives MRSA resistance? |
mecA gene |
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MC presentation of MRSA?
how is it dx? |
abscess abscess + cellulitis cellulitis
Dx w/ culture |
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How do you tx a MRSA abscess? |
incision & drainage + oral Ab + topical mupirocin |
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There is no 100% tx for verrucae (warts). What is the best way to eliminate them? |
stimulate immune system |
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At the time of initial herpes infection, the pt may or may not exhibit sx, & the virus will travel down nerves to the ____________ where it remains latent until reactivation. |
dorsal root ganglia |
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When is varicella (chickenpox) contagious? |
from 1-2 days before appearance of initial lesions to 6 days after---> crusts are non-infectious |
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99% of chickenpox cases occur in children & are self-limited. How do the sx differ in adult infections? |
much more severe w/ prodrome & more extensive eruption *may develop into varicella pneumonia |
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50% of Shingles (herpes zosters) involves the ________ nerves |
thoracic nerves (seen on trunk) |
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Post-Herpetic Neuralgia (PHN) is a complication of herpes zoster. What is it? |
persistent intense pain at lesional site that remains after lesion has resolved
*may last months/years (caused by scarring of dorsal root ganglia & atrophy d/t inflammation- tx early to prevent*) |
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________ tinea pedis; white, soggy btwn 4th & 5th toes (interdigital spaces) |
Macerated |
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_________ tinea pedis; erythema, fine scaling, entire sole of foot (well marginated) |
Moccasin |
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How does Tinea Unguium present when d/t autosomal dominant defect in cell-mediated immunity? d/t trauma? |
defect- onychomychosis of ALL nails
trauma- onychomychosis of single nail |
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In Tinea Unguium, ________ involvement NEVER occurs w/o toenail & plantar foot involvement |
fingernail involvement |
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_______ presents as raised red plaques studded w/ perifollicular pustules & may occur secondarily to topical corticosteroid use. |
Majocchi's granuloma (tinea profunda) |
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Tinea ________ does NOT respond to TOPICAL anti-fungals & requires oral systemic tx |
Tinea capitis
(superficial & follicular involvement requires systemic tx) |
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Tinea Barbae occurs only in men who shave
How can you differentiate this from Sycosis Barbae? |
Tinea Barbae- KOH culture shows fungi
(sycosis- staph bacteria) |