Organism Differentiation Flashcards

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1
Q

Escherichia coli positives

Indole

Lactose

H2S

Oxidase

Other

A

Indole positive

Lactose positive

E+

Motile

Serotyping O,H and K

May be beta hemolytic

EHEC (Shiga Toxin)

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2
Q

Klebsiella pneumonia positives

Indole

Lactose

H2S

Oxidase

Other

A

Lactose

E+

Non-Motile

Serologic- O and K antigens

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3
Q

Citrobacter freundii positives

Indole

Lactose

H2S

Oxidase

Other

A

Lactose (late)

H2S

E+

Motile

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4
Q

Proteus Mirabilis positives

Indole

Lactose

H2S

Oxidase

Other

A

H2S

E+

Motile

coccobacilli

BAP swarming

LIA-R w/ H2S

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5
Q

Shigella sonnei positives

Indole

Lactose

H2S

Oxidase

Other

A

All Negative

E+

Non-Motile

Serotyping O

Shiga toxin

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6
Q

Salmonella enteritidis positives

Indole

Lactose

H2S

Oxidase

Other

A

H2S

E+

Motile

Serotyping O,Vi,H

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7
Q

Yersinia enterocolitica positives

Indole

Lactose

H2S

Oxidase

Other

A

All Negative

E+

Non-Motile

CIN- bullseye colonies

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8
Q

Pseudomonas aeruginosa positives

Indole

Lactose

H2S

Oxidase

Other

A

Oxidase

Fruity/grape odor

Metallic sheen (BA)

Flat and spreading

Pigment

**Can grow at 42 degrees

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9
Q

Acinetobacter spp. positives

Indole

Lactose

H2S

Oxidase

Other

A

All negative

Coccobacilli

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10
Q

Stenotrophomonas maltrophilia positives

Indole

Lactose

H2S

Oxidase

Other

A

All negative

ammonia smell

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11
Q

Vibro cholearae positives Indole Lactose H2S Oxidase Other

A

Indole

Oxidase

Curved rods

Growth NaCl

API

Serotyping

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12
Q

Eikenella corrodens

Indole

Lactose

H2S

Oxidase

Other

A

**Oxidase **

Bleach smell

Corroding/pitting of Agar

NO GROWTH on MAC

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13
Q

Pasturella mulcocida

Indole

Lactose

H2S

Oxidase

Other

A

Indole

Oxidase

H2S

MAC- no growth

BA- gray, non-hemolytic

Ovoid gran neg rods (Bi-polar, pleomorphic)

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14
Q

Legionella pneumophilia

Indole

Lactose

H2S

Oxidase

Other

A

Oxidase

(indole/H2S unknown)

THIN gram neg rods (faint, not usually seen on gram stain)

Small grey glistening colonies, “cut glass”

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