Dermatophytic Infections Flashcards
What are the 3 genera of dermatophytes
Microsporum
Trichophyton
Epidermophyton
Where do the dermatophytes invade
Stratum cornuem of skin hair and nails
What is the benefit of KOH testing
quick and cheap to do a diagnosis
What is particular to fungi
Hyphae
Why is PSA less specific
It only picks up carbohydrates
What might be the typical anatomical sites for dermatophytes
Groin
Feet esp if they are wearing occlusive and synthetic footwear
Head
Arms
What are the ideal conditions for bacteria to grow
Heat sweat and water
What are some characteristics of fungal infection to help with differential diagnosis
Itch / irritation or burning sensation
Dry and scaly w exception of athelete foot
Sharp advancing marign btwn infected and non infected skin
What are some of the common causes of atheletes foot
T rubrum
T interdigitale
E floccosum
What is the common causes of tinea corporis
T rubrum
How do you differentiate ringworm from psoriasis and annular dermatitis
Note for central sparring which is characteristic of ringworm
What are the 4 reasons for treatment failure
Incomplete treatment
Wrong diagnosis
Reinfection
Antifungal resistance
What is nystatin used for
Candida albicans (vaginal infection??)
Why would tolnaftate not be useful
The usage is for 2-3 weeks so the patient may not be adherent
What are the azoles to memorise
Clotrimazole
Ketoconazole
Isoconazole
Miconazole
Sertaconazole
