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Fungus Presentation .pdf



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SUPERFICIAL
FUNGAL INFECTION
DR. HOSNE ARA BEGUM

ASSOCIATE PROFESSOR
DEPT. OF DERMATOLOGY & VENEREOLOGY
BIRDEM HOSPITAL

Superficial Fungus
Fungus may be defined as non–photosynthetic
microorganism growing as a mass of branching
& interlacing filaments.

Numerous fungi are capable of invading• Epidermis,
• Adnexa (hair/nail apparatus) &
• Mucosal sites (oropharynx ,
anogenitalia).

EPIDEMIOLOGY AND INCIDENCE
The incidence of fungal infection is influenced by –
Geographical locations are important factors
T. tonsurans, M. audouinii have been frequently noted
in the New York , whereas T violaceum is
prevalent in the former Soviet Union, Yugoslavia and Spain.
Environmental factors: help promote the propagation of
many opportunistic fungi-like excessive perspiration in
hot and humid climate favours fungal infection.

Genetic susceptibility: to certain forms of
fungal infections may be related to the types of keratin or
degree or mix of cutaneous lipids produced.

Host factors
Host factors are very significant in the development of fungal infection.
These include-

Immunity- immuno suppressed patients are more susceptible to
severe and refractory dermatophytosis.
Chronic disease- like diabetes mellitus, HIV favours fungal infection.
only the severity of dermatophytosis is increased with HIV,
not the prevalence.
Human steroid hormones- Particularly androgens such as
Androstenedione can inhibit the growth of dermatophytes.
ABO system- Patient with A blood group is more prone to
dermatophytosis.
Age, sex and race are additional important epidemiologic factors as
dermatophyte infections are five times more prevalent in males
than in females.

Stucture of the Skin

These fungi are commensural organism that frequently
colonize normal epithelium include –
a) Dermatophytes,
b) Candida albcans
c) Malassezia furfur.

The clinical apperance of dermatophytosis depends in part
on the organism involved, the site affected & host reactions.

Dermatophytosis are termed according to the

sites involved.
• Tinea Capitis

• T. Facei

• T. Barbae

• T. Pedis

• T. Corporis

• T. Cruris

• T. Manum

• Onychomycosis

Tinea Capitis
• Non Inflammatory
type

• Inflammatory type


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