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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 ))

MC superficial bacterial infection in children



*highly contagious

Impetigo

Bullous Impetigo is caused by _________

S. aureus

Non-bullous Impetigo is caused by __________

S. aureus > S. pyogenes

____________ primarily occurs in children (<6), but when it occurs in adults it has >50% mortality

Staphylococcal Scalded Skin Syndrome (SSSS)

What causes the blisters to form in SSSS?

exfoliatoxins A & B (ET-A & ET-B) from Staph Aureus

__________ skin infection of the dermis caused by Strep. pyogenes.

Erysipelas

MC cause of folliculitis __________

S. aureus



(pseudomonas aeruginosa also common, esp from whirlpools)

In ______________ , monomorphic pustules are seen 1-3 days after exposure to contaminated water

Hot tub folliculitis (p. aeruginosa)

___________ is deep folliculitis, pustules surrounded by halo of erythema & caused by shaving

Sycosis Barbae (beard area folliculitis)



(staphylococcus infection)

How does psuedofolliculitis barbae differ from sycosis barbae?



Tx:

caused by ingrown hairs--> created foreign body rxn (not an infection)



Tx: benzoyl peroxide + clindoamycin

Diff btwn abscess & furuncle?


(BOTH contain pus)

furuncle involves a hair follicle



*carbuncle = collection of furuncles

What gives MRSA resistance?

mecA gene

MC presentation of MRSA?



how is it dx?

abscess


abscess + cellulitis


cellulitis



Dx w/ culture

How do you tx a MRSA abscess?

incision & drainage + oral Ab + topical mupirocin

There is no 100% tx for verrucae (warts). What is the best way to eliminate them?

stimulate immune system

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

When is varicella (chickenpox) contagious?

from 1-2 days before appearance of initial lesions to 6 days after---> crusts are non-infectious

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

50% of Shingles (herpes zosters) involves the ________ nerves

thoracic nerves


(seen on trunk)

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*)

________ tinea pedis;


white, soggy btwn 4th & 5th toes


(interdigital spaces)

Macerated

_________ tinea pedis;


erythema, fine scaling, entire sole of foot


(well marginated)

Moccasin

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

In Tinea Unguium, ________ involvement NEVER occurs w/o toenail & plantar foot involvement

fingernail involvement

_______ presents as raised red plaques studded w/ perifollicular pustules & may occur secondarily to topical corticosteroid use.

Majocchi's granuloma (tinea profunda)

Tinea ________ does NOT respond to TOPICAL anti-fungals & requires oral systemic tx

Tinea capitis



(superficial & follicular involvement requires systemic tx)

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)