Saturday, July 5, 2008

7 - dermatophytosis mcqs

8Q: about dermatophytosis all are true except ?

a. trichophyton affects the skin , hair and nails

b. candida is known to cause only systemic infection only

c. epidermophyton affects the skin and nails

d. microsporum affects the skin and hair

answer : b . candida albicans causes many local lesions like oral thrush,vaginitis etc .

well , the first thing u have to know is

Q: what is dermatophytosis ?

Answer : superficial fungal infections are called dermatophytosis .

Q: what are dermatophytes ?

Answer: the organisms that cause dermatophytosis are called dermatophytes .

--- so lets know a few dermatophytes

Q: what are the most important dermatophyte infections and what part do they affect?

Answer : 1. Microsporum : affects skin and hair (MSH)

2. Epidermophyton : affects skin and nails (ESN)

3. Trichophyton : affects skin , hair and nails (tri = for 3)(TSHN)

Skin is involved in all the three cases .

FAMCQ ( frequently asked mcqs) from this topic are

Q: what is the dermatophyte that does not involve the hair ?

--- this question can also be asked as

Q: what is the dermatophyte that does not cause tinea capitis ?

Answer : epidermophyton

--- then u must know

Q; what is the organism that most commonly causes tinea capitis ( superficial fungal infection of scalp,eyebrows etc )?

Answer : trichophyton tonsurans followed by trichophyton rubrum and then trichophyton violaceum .

Q: what is the dermatophyte that does not involve nails ?

Answer : microsporum

--- another disease related to this dermatophytes is Tinea mannum, a question regarding this is

Q: fungal dermatitis of hands is called ?

Answer : tinea manum (remember manicure)

Q: most common agent causing tinea manum?

Answer : trichophyton rubrum.

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