Cutaneous Fungi Flashcards
Superficial fungi
Malassezia furfur
Exophiala werneckii
Piedraia hortae
Trichosporon beigelii
Dermatophytes
Microsporum
Trichophyton
Epidermophyton
Alopecia
Baldness
Anthropophilic
Infection passed human to human
Ectothrix
Fungi produce arthrospores on surface of hair shaft or just beneath cuticle where break out onto hair shaft
Endothrix
fungi invade hair shaft and produce arthrospores within the shaft
Favus
Severe disfiguring fungal disease
Classical feature is development of cup-shaped scutula on surface of scalp
Geophilic
Dirt loving, infection in man comes from contact with soil containing infecting organism
Piedra
Spanish for stone
Fungal disease of hair characterized by formation of numerous hard, small waxy concretions on the hair shaft
Tinea
Ringworm or superficial infection of the skin, nail, hair
On body surface fungal infection forms a ring shape lesion that was once thought to be caused by parasite
Zoophilic
Infection passed from animal to animal; man sometimes is an accidental host
Tinea pedis
Athletes food
Infection of the feet
Organism invades particularly the toe and soles
Most commonly caused by: E. floccosum, T. mentagrophytes, and T. rubrum
Tinea unguium
Infection of the nails
Infection lies between nail and bed forming a yellow detritus
Over time, nail plate fragments and may completely disintegrate
Most common - T. rubrum and E. floccosum
Tinea corporis
Ringworm
Infection involves glabrous skin and produces lesions that vary from those of simple scaling to deep granulomatous lesions
Characterized by ringed skin lesions which have active erythematous margins
Most common - T. rubrum and T. mentagrophytes
Tinea barbae
Barber’s itch
Infection of bearded areas of face and neck
Found in areas where cattle are raised, milked, or fed
Lesions involve skin of the beck where a granulomatous process can involve deeper layers of the skin
Most common - T. mentagrophytes, T. verrucosum, T. rubrm, M. canis
Tinea capitis
Ringworm of the scalp
Ectothrix (fungus invades hair shaft) - M. audouinii, M. canis, M. gypseum, T. mentagrophytes, T. verrucosum, T. rubrum
Endothrix (fungus infection within hair shaft) - T. tonsurans, T. violaceum, T. schoenleinii
Tinea favosa
Chronic ringworm infections of scalp that leads to scarring and baldness
T. schoenleinii, T. violaceum, M. gypseum
Tinea cruris
Jock itch, infection of the groin and perianal region
T. rubrum, E. floccosum
Microsporum species Infection locations
Hair and Skin only
Ectothrix
Fluoresces green under Woods lamp
Microsporum Macroconidia
Multi-septate with rough or spiny surfaces usually clavate or fusiform - never pencil shaped
Microsporium microconidia
Fewer than Trichophyton
Small, spherical to oval attached directly on hyphal
Trichophyton species infection information
Attacks hair, skin, and nails
Trichophyton Macroconidia
Smooth tin walled and fewer septations than Microsporium
Cigar or pencil shaped
Maybe absent
Trichophyton Microconidia
Produced in profusion and are borne laterally along the hyphae or in clusters
Epidermophyton species infection information
Infects skin and nails
Epidermophyton Macroconidia
Large only 2-6 septa, thick walled clavate with smooth surface form in clusters of 2 or 3 short blunt conidiophores
Epidermophyton Microconidia
Absent
T. mentagrophytes Testing
Fluorescence Negative
Hair Baiting Positive
Urease Positive
Ectothrix - No reverse red pigment
T. rubrum Testing
Fluorescence Negative
Hair Baiting Fails to Perforates hair
Urease negative
Ectothrix: Reverse red color on CMA
T. tonsurans Testing
Fluorescence Negative
Hair Baiting N/A
Endothrix
T. violaceum Testing
Fluorescence Negative
Hair Baiting N/A
Endothrix
T. verrucosum Testing
Fluorescence Negative
Hair Baiting N/A
Endothrix
M. canis Testing
Fluorescence Positive
Hair Baiting N/A
Ectothrix
Growth on Polished Rice
M. gypseum Testing
Fluorescence Negative
Hair Baiting N/A
Ectothrix
Grows on Polished Rice
M. audouinii Testing
Fluorescence Positive
Hair Baiting N/A
Ectothrix
Does not grow on Polished Rice
