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STAPH and MICROCOCCACEAE ID

Total questions: 22

Worksheet time: 13mins

Name
Class
Date
1.

Which are biochemical result for Staph?

a)

 Glucose oxidizer

b)

Gluc. fermenter

c)

Bacitracin S

d)

Bacitracin R

2.

Which are biochemical result for Micrococcus?

a)

Facultative Yes

b)

Facultative No

c)

Lysostaphin S

d)

Lysostaphin R

3.

Which are biochemical result for Staph?

a)

Facultative Yes

b)

Facultative No

c)

Lysostaphin S

d)

Lysostaphin R

4.

Which are biochemical result for Micro?

a)

 Glucose oxidizer

b)

Gluc. fermenter

c)

Bacitracin S

d)

Bacitracin R

5.

biochemical ID matching

Coagulase -

Growth on MSA &

Mannitol -

Novobiocin S (urine)

a)

Stap. aureus

b)

Stap. Sapro

c)

Stap. Epi

d)

Micrococcus ssp.

6.

STAPH AUREUS ANTIBIOTIC RESISTANCE includes sensitivity to _____

a)

Penicillin G

b)

ampicillin

c)

cephalosporins

d)

all of the above

7.

Which is the enzyme tested in S. aureus to determine sensitivity to penicillin G?

a)

B-lactamase

b)

Coagulase

c)

Hyaluronidase

d)

Nucleases (DNAse)

8.

When in NOT a chemical toxin released by S. aureus?

a)

Enterotoxin

b)

Exfoliatin/ Leukocidin

c)

TSST (Toxic Shock Syndrome Toxin)

d)

Fibrinolysin

9.

How do you determine STAPH AUREUS ANTIBIOTIC RESISTANCE?

a)

Kirby Bauer testing 

b)

Rapid chromagenic cephalosporin test

c)

enzyme tetstng for attacks on B-lactam ring

d)

ChromAgar Screen

10.

What is the testing method to determine MERSA strains of S. aureus?

a)

ChromAgar Screen

b)

Oxacillin screen Kirby-Bauer

c)

Rapid chromagenic cephalosporin test

d)

toxin testing methods

11.

Which is NOT specific to the Oxacillin screen Kirby-Bauer for MERSA?

a)

incubate full 24 hrs

b)

look for mauve colonies or Denim blue colonies

c)

Media with increased NaCl

d)

incubate no higher than 35oC

12.

Purpose: Screen for MRSA carriers

Specimen: Anterior nares/other

Media: contains Cefoxitin, other inhibitors and a chromagenic substrate

a)

 CHROMagar Screen

b)

BACITRACIN (TAXO A)SUSCEPTIBILITY

c)

CAMP TEST

d)

SODIUM HIPPURATE TEST

13.

Principle: MRSA will produce an enzyme that hydrolyzes the chromagenic substrate, resulting in mauve-colored colonies or denim blue colonies—depends on media/company used

a)

 CHROMagar Screen

b)

BACITRACIN (TAXO A)SUSCEPTIBILITY

c)

CAMP TEST

d)

SODIUM HIPPURATE TEST

14.

STEPS:

Inoculate Media/Streak for isolation

Incubate in the dark in air at 35-370C for 24 hrs.

(+/- 4 hrs.)

Observe for denim blue or mauve colonies, produced by MRSA

a)

 CHROMagar Screen

b)

BACITRACIN (TAXO A)SUSCEPTIBILITY

c)

CAMP TEST

d)

SODIUM HIPPURATE TEST

15.

Which is true of VRSA?

a)

Vancomycin Resistant Staph aureus

b)

found in all Stap. ssp

c)

Resistance to penicillin G

d)

MERSA Stap aureus

16.

biochemical ID matching

Coagulase -

Growth on MSA &

Mannitol +/-

Novobiocin R

a)

Stap. aureus

b)

Stap. Sapro

c)

Stap. Epi

d)

Micrococcus ssp.

17.

biochemical ID matching

Coagulase +

Mannitol Salt (MSA) +

DNase/Thermo-nuclease +

a)

Stap. aureus

b)

Stap. Sapro

c)

Stap. Epi

d)

Micrococcus ssp.

18.

gpc, pairs & clusters

(tetrads)

a)

Coag negative Staph & Micrococcus

b)

Alpha strep (strep viridans)

c)

Corynebacterium (diphtheroids)

d)

Yeast

e)

Propionibacterium

19.

gpc, pairs and chains

a)

Coag negative Staph & Micrococcus

b)

Alpha strep (strep viridans)

c)

Corynebacterium (diphtheroids)

d)

Yeast

e)

Propionibacterium

20.

Pleomorphic gpb

a)

Coag negative Staph & Micrococcus

b)

Alpha strep (strep viridans)

c)

Corynebacterium (diphtheroids)

d)

Yeast

e)

Propionibacterium

21.

gram positive to gram variable, round to oval cells

a)

Coag negative Staph & Micrococcus

b)

Alpha strep (strep viridans)

c)

Corynebacterium (diphtheroids)

d)

Yeast

e)

Propionibacterium

22.

(anaerobe): pleomorphic gpb

a)

Coag negative Staph & Micrococcus

b)

Alpha strep (strep viridans)

c)

Corynebacterium (diphtheroids)

d)

Yeast

e)

Propionibacterium