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BacT JK > Fungi > Flashcards

Fungi Flashcards

1
Q

Which of the following is INCORRECT regarding yeast?

A. Oval, spherical cells
B. Multicellular
C. Variability in form (chains known as pseudohyphae)

A

B. Muticellular

Unicellular

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2
Q

Which of the following is INCORRECT regarding molds?

A. Muticellular
B. Main element (tubular structure) of the vegetative/growing form is pseudohyphae
C. Can be divided by setpa (cross-walls)

A

B. Main element (tubular structure) of the vegetative/growing form is pseudohyphae

Main element: HYPHAE!

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3
Q

T/F. Molds can be either septate or non-septate (coenocytic).

A

True.

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4
Q

T/F. Dimorphic fungi: change from yeast (room temp.) to mycelial form (at 37C or in the tissues of animals).

A

False.

Change from MYCELIAL FORM (room temp.) to YEAST (at 37C or in the tissues of animals).

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5
Q

What kind of lesions do fungi cause?

A

Granulomatous

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6
Q

What are the factors that predispose to fungal invasion of tissues?

A

Immunosuppression, prolong ABC therapy, immunological defects, immaturity, aging and malnutrition, exposure to heavy challenge of fungal spores, traumatized tissues, persistent moisture on skin surface, some neoplastic conditions.

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7
Q

What are the two causative agents regarding Dermatophytes?

A

Microsporum (MOST IMPORTANT in domestic animals)

Trichopytan

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8
Q

T/F. Dermatophytes are included in the phylum Ascomycota and they are non-zoonotic.

A

False.

They ARE within the phylum Ascomycota but they are ZOONOTIC.

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9
Q

What agar do Dermatophytes grow on? What color does it depict? What are produced when they are grown in a culture?

A

SabDex
Yellow/white
Macronidia and microconidia

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10
Q

T/F. Microconidia produced in a culture is more useful for ID than macroconidia.

A

False.

Macroconidia IS!

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11
Q

Which of the following is INCORRECT regarding the characteristics of Trichophyton?

A. Cylindrical or cigar-shaped
B. Smooth
C. Thin or thick walled macroconidia
D. Grows rapidly in cultures

A

D. Grows rapidly in cultures

Grows slow in cultures (DON’T CONFUSE IT FOR DEMODEX!)

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12
Q

T/F. There is a synergistic action with some bacteria (Stphylococcus spp.) so you want to treat the Staphlococcus spp. first.

A

True

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13
Q

T/F. In the parasitic state (fresh sample), only hyphae are seen.

A

False.

Hyphae and arthroconidia (arthrospores)

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14
Q

T/F. You will see itching in dogs and cats that are affected with ringworm.

A

False.

YOU WILL NOT!

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15
Q

What are the other names for “ringworm”?

A

Cutaneous mycoses

Dermatophytosis

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16
Q

How do you determine that the lesion is caused by ringworm? What is another term for ringworm that is used for humans?

A

Roughly circular pattern of the lesions and their inflamed margins.
“Tinea” is the term used for humans.

17
Q

How do you diagnose ringworm in cats and dogs?

A

Exam of lesions with a WOOD’S LAMP

Test Q’s: 50-60% of infected animals will be positive (so may not see it fluorescent).

18
Q

T/F. When you are scraping, you want to scrape the middle of the lesion.

A

False.

You want to scrape from the MARGINS of any lesion.

19
Q

What are the two cultures that are used for Dermatophytes?

A

Sabouraud’s dextrose (SabDex) agar

Dermatophyte Test Medium (DTM)

20
Q

What is DTM culture? What is a disadvantage?

A

DTM culture: phenol red indicator.

BEWARE of FALSE POSITIVE!

21
Q

Which animal species is affected by dermatophytosis that is caused by T. verrucosum?

A

Cattle (usually calves)

22
Q

Which species cause Dermatophytosis in young horses and is associated with tack and grooming gear?

A

T. equinum

23
Q

Which animal species is affected by dermatophytosis that is caused by M. nanum?

A

pigs (no age predilection)

24
Q

What does M. gallinae cause in poultry?

A

Avian ringworm or favus

25
Q

Which of the following is NOT a characteristic of Fungi?

A. Eukayotic
B. Non-photosynthesis
C. Heterotrophic
D. Aerobic
E. Spore-bearing
F. No cell wall
G. Capsule
A

F. No cell wall

Cell wall: chitin, cellulose proteins, and lipids (ERGOSTEROL)
Provides rigidity and osmotic stability

BacT JK (10 decks)

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