3.DESCRIPTION AND IDENTIFICATION AND CLINICALIMPORTANCE OF MICROSPORUM SPP.pptx

DESCRIPTION AND IDENTIFICATION AND CLINICAL IMPORTANCE OF MICROSPORUM SPP, EPIDERMOPHYTON SPP AND TRICHOPHYTON SPP BY DR. RAZAQ MOMOH • Generally, filamentous fungi or moulds that affect only the superficial keratinized tissues of the skin, hair and nails. • Otherwise called Ringworm, Tinea or Der...

DESCRIPTION AND IDENTIFICATION AND CLINICAL IMPORTANCE OF MICROSPORUM SPP, EPIDERMOPHYTON SPP AND TRICHOPHYTON SPP BY DR. RAZAQ MOMOH • Generally, filamentous fungi or moulds that affect only the superficial keratinized tissues of the skin, hair and nails. • Otherwise called Ringworm, Tinea or Dermatophytes • Usually, living tissues are not involved • There are three (3) implicated genera : • 1. Trichophyton • 2. Microsporum • 3. Epidermophyton Note: In lesions, they form septate hyphae and asexual spores(micro- and macroconidia) with powdery and pigmented colonies • They are differentiated mainly by the nature of their macroconidia • Microsporum spp tend to produce distinctive multicellular macroconidia with echinulate walls. • Microsporum canis is known to form a colony with a white cottony surface and a deep yellow colour on the reverse side, with a thick walled, 815 celled macroconidia with curved or hooked tips • Microsporum gypseum produce a tan, powdery colony with abundant thin-walled 4- to -6 celled macroconidia • NOTE: Microsporum species infect HAIR and SKIN only. • Epidermophyton floccosum is the only pathogen in this genus • It produces only macroconidia which is smooth-walled, clavate, 2- to -4 celled and formed in small clusters • It has flat velverty colonies with a tan to olive-green tinge • Epidermophyton infect SKIN and NAILS only • Trichophyton species develop cylindric smooth walled macroconidia and characteristic microconidia. • Depending on species, T. mentagrophytes colonies maybe cottony to granular. • Both T. mentagrophytes and T. rubrum display abundant grape-like clusters of spherical microconidia on • T. rubrum produce a white, cottony surface and a deep red non-diffusible pigment when viewed from the reverse side of the colony • They also have a microconidia that are small and piriform(pear-shaped) • Trichophyton tonsurans produce a flat, powdery to velvety colony that becomes reddish brown on the reverse • The microconidia seen in this species are mostly elongated. • NOTE: All Trichophyton species Infect HAIR, SKIN and NAILS.