Microbiology Flashcards
Which type of infections does staph aureus usually cause?
Wound Skin Joint Boils Infected eczema Cellulitis Impetigo Staphylococcal scalded skin syndrome
Management of staph aureus infection?
Flucloxacillin
MRSA management
Flucloxacillin won’t work
Use doxycycline, co-trimoxazole, clindamycin, vancomycin
Staph epidermidis
Common skin commensal
Doesn’t usually cause infections
Which type of infections can staph epidermis cause?
Can cause infections in association with implanted/artificial material (i.e. artificial joints, heart valves)
Strep pyogenes
Group A strep
B-haemolytic (complete haemolysis)
Which type of infections does strep pyogenes usually cause?
Infected eczema
Impetigo
Cellulitis
Necrotising fasciitis
Strep pyogenes management
Penicillin
Ringworm
Fungal infection Fungus enters abraded or soggy skin Hyphae spread in the keratin layer Infects keratinised tissue only Increased epidermal turnover causes scaling
What is another word for ‘tinea’?
Ringworm
Tinea pedis
Athletes foot
Ringworm - morphology
Lesions grow outwards and heal in the centre resulting in a ‘ring’ appearance
Ringworm - source of infection
Humans, animal, soil
Ringworm - causative organisms
Trichophyton-rubrum
Trichophyton-mentagraphytes
Ringworm - investigations
Fluorescence
Skin scrapings
Nail clippings
Ringworm - management
Clotrimoxazole
Terbinafine cream
Topical nail paint (amorolfine)
Candida
Yeast infection
Candida - commonly affected areas
Common at skin folds where area is warm and moist
Genitals
Candida - investigations
Swab for culture
Candida - management
Clotrimoxazole
Oral fluconazole
Nystatin
Scabies
Parasitic infection
Highly infectious
Scabies - causative organism
Sarcopetes Scabiei
Scabies - commonly affected areas
Finger webs, genitals, wrists
Scabies - clinical presentation
Itchy rash
Scabies - incubation period
Up to 6 weeks
Scabies - management
Malathion lotion applied overnight to whole body Benzyl benzoate (avoid in children)
Lice - clinical presentation
Intense itch
Lice - commonly affected areas
Head
Lice - management
Malathion
