THE YEAST Flashcards
(18 cards)
Responsible for the most commonly encountered opportunistic fungal infections
Candidan spp.
positive germ tibe candida
Candida albicans
most widely used method for the rapid detection of C. neoformans in clinical specimens
India ink preparation
Diagnosis is typically made by identifying the encapsulated yeast in the spinal fluid using India ink
Cryptococcus neoformans
causes tinea versicolor: skin infection characterized by superficial, brownish, scaly areas on light-skinned individuals and lighter areas on dark-skinned people
Malassezia spp.
“spaghetti and meatballs”
Malassezia furfur
Causes dandruff
Malassezia furfur
Causative agent of “black
piedra”
scalp hair infection
Piedraia hortae
Tinea nigra
- brown to black non scaly macules
- palms and soles
Hortaea wernecki
“ white piedra”
- occurs in hair shaf
Trichosporon spp.
Resemble Cryptococcus spp., appearing as round, oval-shaped, budding yeasts that produce capsules
Typically recovered from moist environmental sources such as shower and bathtub grout, shower curtains, and toothbrushes
Rhodotorula spp.
Common yeast that is used in baking and the preparation of a variety of food products
Saccharomyces cerevisiae
Selective media for Isolation and
presumptive identification of yeast and fungi
Chromogenic agar
allows identification of pathogenic yeast by examining the microscopic morphology of inoculum growth
Cornmeal agar
Mucorales: Slide culture preparations shows “ umbrella-shaped”
Rhizopus
Mucorales spp. that can be recovered from the sinuses; Erect branching into several vesicles that bear sporangioles; White to gray cottony colony
CUNNINGHAMELLA
Mucorales spp: Agent for rhinocerebral mucormycosis; found in patients with diabetes and ketoacidosis
LICHTHEIMIA
Mucorales spp: Agent of disseminated disease; Rhizoids are absent; Dirty white-mousy brown colonies
Mucor
