W33/L4 Flashcards
(27 cards)
Most skin micro biota is gram _____
Positive
Why is the skin resistant to infection? (6)
Low water content Low pH Low temp High salt Fats & fatty acids Microbiota
What are the 4 main causes of skin & soft tissue infections?
Staph aureus
Strep pyogenes
Clostridium perfringens
Pseudomonas
Define folliculitis
Infection of the hair follicle
What tends to predispose to folliculitis?
Some sort of blockage
What’s the most common cause of folliculitis?
Staph aureus
Coagulase + or -: Staph aureus
Positive
Coagulase + or -: Staph epidermidis
Negative
Coagulase + or -: Staph saprophyticus:
Negative
What 4 actions does staph aureus have that protect it from the immune system?
Strong adhesion to damage tissues
Inhibit chemotexis
Inhibit p’cytosis
Inhibit death by PMNs
Define impetigo
Infection of the epidermis
What are the two main causes of impetigo?
Staph. aureus
Strep. pyogenes (GAS)
What are the 3 types of impetigo?
Bullous
Crusted
Pustular
What microbe causes bullous impetigo?
Staph. aureus
We group skin infections into 3 types, what are they?
Localised
Spreading
Necrotising
What are the 2 localised infections?
Folliculitis
Abcess
What are the 3 spreading infections?
Impetigo
Erysipelas
Cellulitis
What’s the typical cause of erysipelas?
Strep. pyogenes
Define erysipelas
Rapidly spreading erythematous infections with well-defined border + pain & fever
Define cellulitis
A skin infection with subcutaneous fat involvement
What family of bugs are the most common cause of gas gangrene?
Clostridiums
What are some typical presentations of pseudomonas infections?
Diabetic foot ulcers
Burns
What’s the scientific name for scabies?
Sarcoptes scabei
In which people do we sometimes see a disseminated herpes virus, and what’s the name of this condition?
People with eczema
Eczema herpeticum
