Fungus

Question 1

An isolate produced a constriction that was interpreted as a positive germ tube but C albicans was ruled out when confirmatory testing were performed. Which fungi is it? C tropicalis, C neofromans, C glabrata, or Rhodoturla rubra?

Answer 1

C tropicalis forms pseudohyphae forms constriction

Question 2

Blastoconidia are the beginning of which structures?

Answer 2

Pseudohyphae

Question 3

Arthroconidia production is used to differentiate which two yeast isolates?

Answer 3

Trichosporon cutaneum & Cryptococcus neoformans

Question 4

The urease test, niger seed agar, and the germ tube test are all used for the presumptive id of:

Answer 4

Cryptococcus neoformans

Question 5

Carbohydrate assimilation tests are used for the id of yeast isolates by inoculating media:

Answer 5

Free of carbohydrates

Question 6

The mycelial form of H capsulatum seen on agar resembles

Answer 6

Sepedonium species

Question 7

Which group of molds can be ruled out when septate hyphae are observed in cultures?

Answer 7

Mucorales (formerly Zygomycetes)

Question 8

Which Microsporum species causes an epidemic form of tinea capitis in children?

Answer 8

Microsporum audouinii

Question 9

A transplant patient is suspected of having invasive aspergillosis on the basis of clinical and radiological findings. Which specimen is best for the initial id of aspergillosis by soluble antigen testing?

Answer 9

Serum or urine

Question 10

The direct microscopic examination also showed hyphal elements with a “spaghetti and meatball” morphological appearance. The most likely id is:

Answer 10

Malassezia furfur