Fungal infections

Question 1

What are the most common affected sites of tinea corporis?

Answer 1

neck and upper trunk.

- leaves a ring pattern

Question 2

Tinea capitis caused by?

Answer 2

• M.canis.

- T.tonsurans.

Question 3

Dermatophytes “species” ?

Answer 3

• Microsporum: (Skin, Hair)
• Trichophyton: (Skin, Hair anf nails)
• Epidermophyton: (Skin, Nalis) (never hair)

Question 4

Tinea manus (hands) ?

Answer 4

• Asymmetrical.
• associated with tinea pedis.
• Diffuse powdery scaling.
• T.rubrum.

** dermtophytes > Tine epidermis.

Question 5

Dermatophytes clinical classification ?

Answer 5

• Tinea of epidermis (pedis, corporis, manuum, cruris and facialis)
• Tinea of unguium (nails).
• Tinea of capitis (scalp)

Question 6

Wood’s light color for Microsporum ?

Answer 6

blue-green , light green.

Question 7

What is the most common type of fungal infections?

Answer 7

Tines pedis or athlete’s foot. (>50%)

Question 8

Candidiasis ttt?

Answer 8

• Nystatin and imidazole

Question 9

Dermatophytes diagnostics methods ?

Answer 9

• Direct examination (light microscope)
• Indirect examination (fungal culture)
• Wood’s light.
• Dermatopathology (PAS staining)

Question 10

Wood’s light color for Trichophyton ?

Answer 10

NONE.

Question 11

Interdigital candidiasis occurs mostly between?

Answer 11

The middle and ring fingers.

Question 12

Dermatophytes invades ?

Answer 12

Keratinized structures: epidermis, nails and hair.

Question 13

Tines pedis or athlete’s foot are due to ?

Answer 13

• Trich. rubrum.
• Trich. Mentagrophytes.
• Epid. floccosum.

Question 14

Causative organisms of tinea of the groin ?

Answer 14

• E.floccosum.
• T. rubrum.
• T.interdigitale.

Question 15

Pityriasis versicolor? common cause and pathogenesis ?

Answer 15

• Commensal yeast (malessesia furfur).
• Carboxylic acids released by the organisms inhibit the normal increase in pigment production by melanocytes after sun exposure.