MYCOLOGY Flashcards
(52 cards)
Produce large, ribbonlike hyphae that are irregular in diameter and contain occasional septa;
Rhinocerebral form: most common presentation; nasal mucosa, palate, sinuses, orbit, face, and brain are involved; shows massive necrosis with vascular invasion and infarction
Mucorales
ringworm of the body
Tinea corporis
ringworm of the groin, or “jock itch”
Tinea cruris
ringworm of the scalp and hair
Tinea capitis
ringworm of the beard
Tinea barba
ringworm of the nail
Tinea unguium
ringworm of the feet, or “athlete’s foot”
Tinea pedis
Microscopically: smooth, club-shaped, thin-walled macroconidia with three to eight septa
Macroconidia are borne singly at the terminal ends of hyphae or on short conidiophores
Microconidia: “birds on a fence”; predominate; spherical, pyriform
(teardrop-shaped), or clavate (clubshaped) and 2 to 4 mm
Tricophyton spp.
Tricophyton spp.; Nail dermatophyte;
Microconidia: clavate or peg-shaped
Colony: white downy - pink granular
Young: reverse yellow
Old: wine/red or cherry red
T. rubrum
Rapidly growing colonies may appear as white to cream- colored or yellow, cottony or downy, and coarsely granular to powdery
Microconidia: i. Grapelike
ii. Teardrop-shaped
Appear rose brown on old colonies
T. mentagrophytes
Cultures develop slowly and are typically buff to brown, wrinkled and suede-like in appearance; balloon shaped microconidia
T. tonsurans
glabrous to velvety white colonies colony; occasionally they are flat and disk-shaped ; rare, rat-tail string bean appearance macronidia;
T. verrucosum
Causes a severe type of infection called favus; Characterized by the formation of yellowish cup-shaped crusts, or scutulae, on the scalp; considerable scarring of the scalp; and sometimes permanent alopecia
- “Tinea favosa
- antler hyphae
- white and wrinkled colony
T. schoenleinii
Colonies of are very slow growing, beginning as cone-shaped, cream- colored, glabrous colonies
Later become heaped up, verrucous (warty), violet to purple, and waxy in consistency
Port wine to deep violet
Trichophyton violaceum
primary cause of tinea capitis; black dot ringworm;
Colony: cottony white –salmon - velvety aerial mycelium
M. audouinii
Most common cause of ringworm infection in dogs and cats in the United States
M. canis
Free-living organism of the soil (geophilic); Grows rapidly as a flat, irregularly fringed colony with a coarse, powdery surface
that appears to be buff or cinnamon color
Microsporum gypseum
Growth appears olive green to khaki, with the periphery surrounded by a dull orange- brown
Epidermophtyon sp.
uncommon cause of infection; wound infections and oral thrush; it is an opportunistic pathogen in immunocompromised hosts
Geotrichum candidum
rapidly growing mold (2-6 days) that produces a fluffy to granular, white to blue-green colony; characteristic “foot cell” at their base
Aspergillus fumigatus
Rapid grower (1-5 days); Yellow-green colony aspergillus
ASPERGILLUS FLAVUS
Macroscopically: produces darkly pigmented, roughened spores
Produces mature colonies within 2-6 days
Growth begins initially as a yellow colony that soon develops a black, dotted surface as conidia are produced
ASPERGILLUS NIGER
