Exam 58: Hyaline Molds, Zygomycetes, Dermatophytes, and Opportunistic and Systemic Mycoses

Which genus is involved in infections of the skin and nails only?

A fungus is recovered from a nail scrapping.Microscopic examination reveals numerous smooth,thin-walled,club-shaped,multiseptate macroconidia;however,microconidia are absent.The organism can be identified as:

Which dermatophyte usually fluoresces yellow-green under a Wood's lamp?

Which rapidly growing Aspergillus spp.(2 to 6 days)best describes a mold that produces a fluffy-to-granular,white-to-blue green colony?

Unbranched sporangiophores with rhizoids that appear opposite the point where the stolon arises at the base of the sporangiophore best describes which zygomycetes?

The term used to describe ringworm of the nail is:

Which organism produces mostly shades of green or blue-green colonies? Microscopically,hyphae are hyaline and septate and produce brushlike conidiophores.

Match the morphologic features with the dimorphic fungus. -Nonbudding,thick-walled spherule

An organism was isolated after growing 26 days.Colonial morphologic appearance revealed heaped,wrinkled,moist,and yeastlike colonies.As the culture aged,colonies became covered with short aerial mycelium that turned from tan to brown.This organism is most likely:

The slow-growing organism Trichophyton rubrum produces a flat or heaped-up colony,generally white to reddish with a cottony or velvety surface.The cherry-red color is best observed on the reverse side of the colony.This organism is capable of infecting which of the following?

Which two assays should be used together for detecting antibodies toward B.dermatitidis,H.capsulatum,and C.immitis?

Match the morphologic features with the dimorphic fungus. -Single bud connected to the parent cell by broad base

Match the morphologic features with the dimorphic fungus. -Yeastlike cells with internal cross walls

A pulmonary fungus ball and external otomycosis and onychomycosis are all infections caused by which genera?

Trichophyton schoenleinii causes a condition that is characterized by the formation of yellowish cup-shaped crusts or scutulae,considerable scarring of the scalp,and sometimes permanent alopecia.This organism is usually recovered in _____ days.

Which of the following Trichophyton spp.grows slowly (14 to 30 days)and best at 35°C to 37°C? In addition,enriched media with thiamine and inositol enhance its growth.

A hair perforation test is performed using Trichophyton mentagrophytes and T.rubrum.The expected results are:

Match the morphologic features with the dimorphic fungus. -Small,round-to-oval yeast cells;2 to 5 µm in diameter

Match the morphologic features with the dimorphic fungus. -Budding yeast resembling a "mariner's wheel"

Match the morphologic features with the dimorphic fungus. -Cigar-shaped yeast cells