Mycology - Module 9-11 - ParaClass

Ch. 27

causative agent of tinea negra

Hortaea werneckii

causative agents of chromoblastomycosis

Fonsecaea compacta

Fonsecaea pedrosoi

Phialophora verrucosa

pt with pale patches on arms and legs. fungal culture shows “spaguetti and meatball” appearance

Malassezia furfur

Blastomyces dermatitidis

Grown at 35°C: large, broad-based budding yeast

Grown at 22°C: conidia borne on short lateral branches ovoid to dumbbell-shaped and with varying diameter (2-10um)

Coccicoides immitis and C. posadasii

Secretions may reveal spherules containing endospores.

22°C: alternating (separated by disjunction cell) hyaline arthroconidia

Histoplasma capsulatum

35°C: small yeast cells with size of 2-3um X 4-5um.

22°C: nondescript spherical microconidia and tuberculate macroconidia

Sporothrix schenkii

35°C: small, cigar-shaped yeast cells

Mold phase: conidia in rosette pattern at the ends with delicate conidiophores. Dark-walled conidia being produced along sides of the hyphae

Nannizzia Gypsies

Fusiform, moderately thick-walled conidia (8-15 X 25-60um) with as many as 6 cells

Some isolates - distal end of macroconidium may bear thin filamentous tail

Microsporum canis

Spindle shaped macroconidia with echinulate, thick walls measuring 12-25 X 35-110um with 3 to 15 cells. Tapering, sometimes elongated, spiny distal ends of macroconidia.

what are the differences between chromoblastomycosis and emycotic mycetoma

what are the major differences between bacteria and fungi

how are hyaline fungi different from phaeoid fungi

teleomorph

anamorph

synanamorph

what are the expected results for germ-tube test for Candida albicans?

what morphology is likely seen if inoculated onto cornmeal agar

large, one-celled, smooth to tuberculate macroconidia and smooth or echinulate microconidia are typical of the mycelial-phase of?

Histoplasma capsulatum

which are the infectious structures of Coccidiodes immitis?

arthroconidia

Black-dot ringworm is an edothrix hair involvement caused by which dermatophyte?

Trichophyton tonsurans

a subcutaneous fungal infection described as necrotic ulcers may follow direct inoculation of fungal spores into the skin. The causative agent when cultured at 37ºC forms small, cigar-shaped yeast and at room temp., grows as mold with delicate hyphae and rossete-like conidia. what is the name of the disease?

Sporotricosis spp.

most cases of pulmonary infections and invasive diseases caused by Aspergillus in humans result from?

Aspergillus fumigatus

a 10-yo was admitted with diabetic ketosis. 3 days later he complained of nasal blockage. within 3 days, white fluffy mold grew from the sinus drainage and showed erect sporangiophores terminating in dark sporangia and sporangiophores. Brown rizhoids appeared at the base of the sporangiophores. which is suspected?

Rhizopus spp.

what is the most common cause of eumycotic mycetomas?

Madurella spp.

Fonsecaea and Phialophora are known to cause

chromoblastomycosis

the microscopic exam of a mold demonstrates a cluster of small elliptical buds that may be described as a “floweret” arrangement is most likely

sporothix

which dermatophyte is more commonly associated with tinea pedis in adults

Trichophyton

Mocassin foot may be cause by

Tricophyton

skin scraping obtained from the edge of a lesion demonstrated numerous spindle shaped macroconidia and few microconidia. what is the potential id?

Microsporum

which of the following cause infections of the hair, skin, and nails

Microsporum

Epidermophyton

Tricophyton

fungi appearing as “spaghetti and meatballs” under the microscope is most likely

Malassezia furfur

a leading cause of tinea capitis in children in many parts of the world is

Trichophyton tonsurans

image

Sporothrix

KOH is used for skin, hair, or nail specimens

TRUE

dimorphic fungi have the ability to grow as

as yeast at 37ºC

as mold at 24ºC

the presence of clamp connections can aid in the identification of

Basidiomycota

Trichosporum, Microsporum, and Epidermophyton are all capable of degrading

Keratin

A superficial mycoses caused by Malassezia furfur is characterized by

scaly areas on light skin

a patient presented with complaints of itchy gritty nodules on the scalp. the hair revealed thick-walled cells with 8 ascopores. which fungi is the most likely agent

Piedraia hortae

microsporum, trichophyton, and epidermophyton are commonly referred to as

dermophytes

image

Microsporum spp.

Trichophyton tonsurans has replaced which of the following as the leading cause of gray-patch tinea capitis in children in the US

Microsporum audouinii

Culture grew fungal colony with a dark reverse color.

Trichophyton rubrum

which organism is commonly contracted via rose thorns and sphagnum moss?

Sporothrix

which fungus is dimorphic

Sporothrix

exophiala dermatitidis is associated with infections called

Phaeohyphomycosis

fungi that grow both yeast and mold in the same culture at the SAME temperature are called

polymorphic

nonpigmented or lightly pigmented fungi are called

hyaline

skin lesions stained with Wright;s stain, resembling Histoplasma, with 3-7um oval cells with cross-walls are most likely

Talaromyces marneffei

A fungal species found in bird and bat guano is

Histoplasma

image

Blastomyces

a microscopic exam of a white fungal colony displayed alternating one-celled, barrel-shaped, arthroconidia with disjunctor cells

Coccoidiodes

inhalation of arthroconidia causing toxic erythema, arythema nodosum, arythema multiforme, and arthritis, is caused by

Coccoidioides

Thrush is an oral fungal infection caused by

Candida`

mold phase of

Coccoidiodes

what species causes reticuloendothelial cytomycosis, cave disease, spelunker disease, and darling disease

Histoplasma

which is not characterized as dimorphic?

Aspergillus

image

Fusarium spp.

which fungus is associated with keratitis from contaminated lens solution

Fusarium spp

fungi associated with tomato rot and chronic sinusitis

Alternaria

organisms causing outbreaks in healthcare settings of multidrug resistance strains

Candida auris

nonfilmentous fungus that has a trophozoite, precyst, and cyst stage

Pneumocystis

image

Cryptococcus

culture revealing large yeast with a broad base is most likely

Blastomyces

a lung biopsy revealled a thick-walled budding yeast with multiple buds, resembling “mariner’s wheel”

Paracoccidioides

spherules are identifies as

Coccoidioides

Monocytes and macrophages with yeast cells such as in the image are caused by

Histoplasma

image

Aspergillus