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Bacteriology > Lecture 20-22- Mycology > Flashcards

Lecture 20-22- Mycology Flashcards

1
Q

Define heterotroph

A

obtain carbon by consuming organisms

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2
Q

What is contained in fungal cell membranes?

A

Sterols (ergosterol)

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3
Q

Unicellular fungal form-

A

yeast

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4
Q

Multicellular fungal form-

A

mold

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5
Q

Fungi that switch between yeast and mold forms-

A

dimorphic

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6
Q

Branches of multicellular mold-

A

hyphae

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7
Q

Group of tangled hyphae-

A

mycelium

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8
Q

Cross walls within hyphae-
The two categories based on them

A

Septa
Septate vs coenocytic

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9
Q

Dark pigmented hyphae-

A

Dematiaceous fungus

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10
Q

Non-pigmented hyphae-

A

Hyaline fungus

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11
Q

What test can be used to detect Fungal pathogens in the blood (low specificity?

A

Beta D-glucan assay

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12
Q

What type of stain looks at fungal hyphae in large sections of tissue

A

Calcofluor stain

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13
Q

What is the difference between Sabouraud Dextrose Agar and Sabouraud Dextrose Agar with cycloheximide

A

Both inhibit bacteria, cycloheximide inhibits fast growing saprophytic fungus

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14
Q

What cell wall molecule is often targeted by antifungal drugs

A

Ergosterol

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15
Q

What is Griseofulvin effective against?

A

dermatophyte cell division

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16
Q

What are dermatophytes?

A

Fungal species that infect skin

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17
Q

What species is the major reservoir for Microsporum canis?

A

Cats

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18
Q

What are the three most common dermatophyte species?

A

Microsporum canis
Trichophyton mentagrophytes
Trichophyton verrucosum

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19
Q

What organism causes ringworm infections in cattle?

A

Trichophyton verrucosum

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20
Q

What organism causes pseudomycetomas in Persian cats?

A

Microsporum canis

21
Q

What causes avian ringworm or Favus?

A

Microsporum gallinae

22
Q

How to dx Microsporum canis in cats

A

Woods lamp fluorescence

23
Q

Can a DTM tube be used for presumptive identification?

A

Yes

24
Q

How should Griseofulvin be administered to fight dermatophytic infections?

A

Orally

25
Q

Which yeast has a footprint shape?

A

Malassezia pachydermatis

26
Q

Which nonbudding yeast causes thrush?

A

Candida albicans

27
Q

What fungus is transmitted through pigeon droppings?

A

Cryptococcus neoformans

28
Q

What fungal pathogen is emerging and found in eucalyptus trees

A

Crytptococcus gattii

29
Q

What fungal pathogen attackes the CNS in immunocompromised patients and can cause granulomatous lesions?

A

Cryptococcus

30
Q

What fungal pathogen has a visible capsule

A

Cryptococcus

31
Q

Which fungal pathogenes are thermaly dimorphic

A

Histoplasma
Blastomyces
Coccidiodes
Sporothrix

32
Q

What fungal pathogen is the most common systemic mycosis?

A

Blastomyces dermatidis

33
Q

What fungal pathogen is characterized by a thick cell wall and broad-base budding

A

Blastmyces dermatidis

34
Q

Where is blastomyces dermatidis endemic

A

Ohio-Mississippi river valley

35
Q

What fungal pathogen is characterized by living within macrophages and inhabiting bird droppings in the Ohio river valley?

A

Histoplasma capsulatum

36
Q

What manifestation of histoplasma capsulatum can occur frequently in dogs, but not people

A

Severe diarrhea and wasting

37
Q

What are the 2 most common causes of fungal infections in cats?

A
  1. Cryptococcus
  2. histoplasma capsulatum
38
Q

What life stage of Coccidioides immitis is inhaled and formed from mycelium?

A

Arthroconidia

39
Q

Where is coccidioides immitis endemic?

A

Southwest

40
Q

What fungal pathogen can manifest as osteomyelitis or respiratory disease?

A

Coccidioides immitis

41
Q

What characteristic can be observed microscopically in a coccidioides immitis infection?

A

spherules containing endospores within the tissue

42
Q

What is the microscopic characteristic feature of sporothrix schenkii?

A

Cigar-shaped, elpongated, pleomorphic yeast within tissue

43
Q

What fungal pathogen is also known as Rose Gardner’s syndrome and causes lymphatic granuomatous lesions in cats and horses?

A

Sporothrix schenkii

44
Q

What type of fungal pathogen is ubiquitous in “moldy environemnts”

A

Asperigillus

45
Q

What fungal pathogen is known to cause a leathery skin pattern on aborted fetuses, air sacculitis, rumenititis, sinusititis, and gutteral pouch mycosis?

A

Asperigillus

46
Q

What pathogen is spread by algea in warm environments?

A

Prototheca

47
Q

WHat disease is caused by Pseudogymnoascus destructans?

A

White-nose syndrome

48
Q

What disease is caused by Rhinosporidium seeberi in mammals and birds

A

Nasal polyps

Bacteriology (11 decks)

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