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Mycology > Opportunistic Fungi > Flashcards

Opportunistic Fungi Flashcards

1
Q

Mucormycetes

A

Organisms are widely distributed in soil, dung, and vegetation
Humans become infected through inhalation of air-borne spores or through ingestion of contaminated foodstuffs.

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2
Q

Lichtheimia complex (Absidia) Micro

A

Aseptate hyphae and wide
Sporangiophores arise at point on stolen that is between the rhizoids
Sporangium is pear shaped

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3
Q

Mucor species Micro

A

Nonseptate, wide hyphae
Long, simple branched sporangiophores
Large, round, spore filled sporangia
NO RHIZOIDS

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4
Q

Rhizopus species Micro

A

Broad hyphae with no or few septations
Numerous stolons connect long groups of unbranched sporangiophores
Rhizoids are at point where stolons and sporangiophores meet

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5
Q

Rhizomucor species

A

Nonseptate, broad hyphae
Rudimentary rhizoids are few in number and located on stolons between sporangiophores

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6
Q

Syncephalastrum species Micro

A

Nonseptate, broad hyphae
Demonstrates short, branched sporangiosphore with swollen tip
Chains of round spores enclosed in fingerlike tubular sporangia

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7
Q

Cunninghamella species Micro

A

Broad, nonseptate hyphae
Long, branched sporangiophore ending in swollen vesicle
Vesicles are covered with spine denticles

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8
Q

Circinella species Micro

A

Mycelium strongly branched, nonseptate
Sporangiophore is erect on mycelium but strongly curved at the tip where sporangium is carried

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9
Q

Aspergillus fumigatus Morph

A

Granular to cottony
Smoky green, grey-green, or green-brown with white apron
Reverse: Yellow
Thermo tolerant

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10
Q

Aspergillus fumigatus Micro

A

Septate hyphae
Conidiophores are long and ending in dome-shaped vesicle
Uniserate phialides which cover only upper portion of vesicle
Long chains of round to ovoid conidia

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11
Q

Aspergillus niger Etiology

A

Swimmer’s ear
Fungus ball

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12
Q

Aspergillus fumigatus

A

Common cause of fungus ball

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13
Q

Aspergillus niger Morph

A

Jet black, powdery
Revers: Buff

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14
Q

Aspergillus niger Micro

A

Septate hyphae
Long conidiophores that have spherical vesicles
Phialides that have long chains of rough, round conidia

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15
Q

Aspergillus flavus Etiology

A

Sinusitis
Otitis
Invasive disease in granulopenic patients

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16
Q

Aspergillus flavus Morph

A

Granular to woolly
Yellow-green or yellow-brown

17
Q

Aspergillus flavus Micro

A

Septate hyphae
Long conidiophores finely echinulated beneath vesicle
Phialides surround entire circumference of vesicle surface
Conidia are smooth, round

18
Q

Aspergillus terreus Morph

A

Powdery
Tan or Cinnamon brown
Reverse: Yellow

19
Q

Aspergillus terreus Micro

A

Small Vesicles
Phialides are biserate and cover upper portion of vesicle
Smooth, elliptical conidia form long chains

20
Q

Aspergillus versicolor

A

Procudes mycotoxins sterigmatocystin and cyclopiasonic
Toxins cause diarrhea and upset stomach, kidney and liver toxicity

21
Q

Aspergillus versicolor Morph

A

Varied in color and range from pale green, to green-beige, pinkish-green, salmon green, or dark green.
Reverse: Colorless to red

22
Q

Aspergillus versicolor Micro

A

Septate hyphae
Conidial heads are biserate and loosely radiate from conidial head
Vesicles are small
Reduced conidial structures may resemble Penicillium species

23
Q

Aspergillus clavatus Etiology

A

Seldom seen in clinical infections
Implicated in pulmonary infections, endocarditis, otomycosis, and various toxic syndroms

24
Q

Aspergillus clavatus Morph

A

Green with white border
Reverse: White to tan

25
Q

Aspergillus clavatus Micro

A

Septate hyphae
Phialides are uniseriate and closely packed on surface of extremely large club-shaped vesicle
Conidia are smooth, round

26
Q

Aspergillus nidulans Etiology

A

Infectionsin lung, brain, bone, eyes, nasal sinus, and skin

27
Q

Aspergillus nidulans Morph

A

Dark green or olive colony with white border
Reverse: Buff, brownish orange or deep reddish purple

28
Q

Aspergillus nidulans Micro

A

Septate hyphae
Conidiophores are short, smooth, and biseriate forming on upper half of vesicles
Hulle cells are usually present

29
Q

Penicillium marneffei Etiology

A

Cause hematological malignancies with patients who are immunosuppressed
Results in pulmonary infection
Lymphatic system, liver, spleen, and bones are usually involved

30
Q

Penicillium marneffei Morph

A

Thermally dimorphic
25 C - colonies are bluiish-grey-green with white apron. Red, rapidly diffusing, soluble pigment observed
37 C - cream colored to slightly pink forming a yeast-like growth with convoluted topology

31
Q

Penicillium marneffei Micro

A

Filamentous phase - similar to other Penicillium species
Yeast phase - globose to elongated sausage-shaped cells

Mycology (9 decks)

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