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USMLE Step I > Stains, Medias, Agars, Pigments and Selection of Bugs > Flashcards

Stains, Medias, Agars, Pigments and Selection of Bugs Flashcards

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USMLE® Step 1 flashcards
1
Q

Giemsa Stain

A

Chlamydia, Borellia, Rickettsia, Trypanosomes, Plasmodium

Certain Bugs Really Try my Patience

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2
Q

Periodic Acid-Schiff

A

Tropheryma whipplei (Whipple’s disease)

Stains glycogen, mucopolysaccharides.

NOT TB

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3
Q

Ziehl-Neelsen (carbol fuchsin)

A

Acid-fast bacteria (Nocardia, Mycobacteria), protozoa (cryptosporidium oocysts)

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4
Q

India Ink

A

Cryptococcus neoformans

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5
Q

Silver stain

A

Legionella, H. pylori, Fungi (e.g. Pneumocystis)

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6
Q

Chocolate agar

A

H. influenzae

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7
Q

Thayer-Martin Agar

A

Neisseria strains

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8
Q

Bordet-Gengou Agar, Regan-Lowe Medium

A

Bordatella pertussis

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9
Q

Tellurite Agar, Loffler medium

A

Corynebacterium diptheriae

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10
Q

Lowenstein-Jensen agar

A

M. tuberculosis

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11
Q

Eaton agar (requires cholesterol)

A

Mycoplasma pneumoniae

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12
Q

MacConkey Agar

A

Lactose-fermenting enterics (pink colonies)

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13
Q

Eosin-methylene blue (EMB) agar

A

E. coli

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14
Q

Charcoal Yeast agar (w/cysteine and iron)

A

Legionella

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15
Q

Sabouraud agar

A

Fungi

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16
Q

Yellow “sulfur” granules

A

Actinomyces israelii

17
Q

Yellow-gold pigment

A

S. aureus

18
Q

Pyocyanin green (green-blue pigment)

A

Pseudomonas aeruginosa

19
Q

Red pigment

A

Serratia marcescens

USMLE Step I (25 decks)

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