Flashcards in 2. Skin, Soft Tissue, and Wound Infections Deck (58):
Cause of swimmer's itch?
Parasitic skin infection by cercariae (burrows into skin)
Source of M. ulcerans
Tropical wetlands (swamps)
Necrotizing fasciitis agents
- S. pyogenes
- S. aureus
Pyoderma that may be caused by Aeromonas (fresh water) or Vibrio (sea water)
Begin as painless papules which become hemorrhagic vesicles that may become necrotic
5 uncommon bacterial infections of the skin
Skin infection due to HSV I? HSV II?
I - cold sores
II - genital herpes
Osler nodes and Janeway lesions are indicative of ...?
Fungal media should be added to all ________ specimens
- Brown, scaly skin patches
- Groin, inner thighs, armpits, toe webs
- Usually in men, obese, diabetics
Pyoderma common caused by Grp A strep; S. aureus more rare
usually a progression of untreated impetigo
infection penetrates the dermis; painful sores at first, then deeper ulcers form
Diffuse distribution of hypopigmented macules
Malassezia furfur (yeast)
Infectious dermatitis common in skin folds of infants and obese adults
2 infections in which Wood's lamp is useful
Erythrasma - lesions fluoresce coral red
Dermatophyte infections - Microsporum fluoresces yellow-green
The only organisms that can grow using keratin
Treatment for this infection could be local hyperthermia (42-43 degC)
"Swimming pool granuloma"
Itraconazole (1st line drug) is for what infection?
Pyoderma caused by Erysipelothrix rhusiopathiae
TSI is often used to screen for this infection (causes H2S+)
Difference between TSS and scalded skin syndrome effect on skin layers?
TSS = necrosis of FULL epidermal layer
SSS = only top layers shed
German measles AKA ______ is caused by ________
Viral infection that is caused by HPV
2 animal bite related organisms that show the same plate growth and only differ in 1 chemical test.
Which 2 organisms and which test?
Pasteurella multocida, Bergeyella zoohelcum
Urea (P. multocida is NEG)
AKA gas gangrene when caused by C. perfringens, other Clostridium
Anaerobic strrep, Enterobacteriaceae
Sulphur granules discharge is common in this infection
Causative agent in non-bullous impetigo? Bullous imepetigo?
Non-bullous - Grp A strep
Bullous - S. aureus
English measles AKA __________ is caused by ________
Treatment for uncommon bacterial skin infections?
Small painful nodules on pads of fingers and toes due to immune complexes deposited in soft tissue
How to differentiate S. intermedius from S. aureus?
S. intermedius is PYR+
4 types of infectious dermatitis
S. aureus, almost anything
Uncommon bacterial skin infection that possibly involves bone
Toxin that causes scarlet fever? Causative agent?
Erythrogenic toxin. GAS.
Acid-fast stains and culture are required for these infections
Skin manifestation caused by S. aureus exfoliative toxins (pyrogenic)
Scalded skin syndrome
Transmitted by body lice (organism + infection)
Term used to denote a dermatophyte infection
Infection of nail cuticle
Special media set up for this type of infection includes: PDA, Mycosel, IMA, SAB, 10% KOH direct exam
- Itchy - scratching spreads it
- Disease of childhood
Schools, daycares (crowded conditions)
S. aureus (bullous)
bull's eye lesion
Small hemorrhagic spots that don't blanch; usually caused by bacterial infections
Bartonella henselae culture requirements and s/?
CHOC, BAP high humidity and CO2 helpful
gnb, occasionally curved
can all cause?
SXT (choice) also Imipenem, amikacin may be used to treat?
2 Mycobacterium where the source can be soil
Animal bite related, long fusiform gnb that exhibits gliding motility
Painless hemorrhagic macules on palms and soles
Specimens required for dermatophyte infection?
Dry skin scraping
Hair or nail clippings
Purpose of KOH in wet prep direct microscope examination of skin scrapings
Clears tissues => easier to see fungal elements
Specimens collected for Bartonella henselae infection?
Lesion biopsies, blood cultures
Ecthyma gangrenosum (EG) is associated with what bacteria?
Also S. aureus, Candida
Antifungal amphotericin B is used to treat..?