CORYNEBACTERIUM

Question 1

Corynebacterium is pleomorphic and does stain irregularly. True or False?

Answer 1

True

Question 2

Corynebacterium occur in what arrangement?

Answer 2

Angular and palisade arrangements (fence of stakes)

Question 3

Corynebacterium produces spores. True or False?

Answer 3

False

Question 4

Corynebacterium is acid-fast. True or False?

Answer 4

False

Question 5

Corynebacterium is motile. True or False?

Answer 5

False

Question 6

Classify the pathogenic species of Corynebacterium based on oxygen requirement.

Answer 6

Facultative anaerobes

Question 7

Corynebacterium equi is reclassified as ?

Answer 7

Rhodococcus equi

Question 8

Corynebacterium pyogenes is reclassified as ?

Answer 8

Actinoymces

Question 8

Corynebacterium suis is reclassified as ?

Answer 8

Eubacterium

Question 9

Other term for C. diphteriae

Answer 9

Diphteroid bacilli

Question 10

Corynebacterium renale type 1 is also called as ?

Answer 10

C. renale

Question 11

Corynebacterium renale type 2 is also called as?

Answer 11

C. pilosum

Question 12

Corynebacterium type 3 is also called as ?

Answer 12

C. cystidis

Question 13

Specie of Corynebacterium that is most frequently isolated from bovine mastitis, ureteritis, and pyelonephritis.

Answer 13

C. renale

Question 14

C. renale is predominant in female or male?

Answer 14

Female

Question 15

Give the morphology and staining of C. renale.

Answer 15

• Large diphteroid bacillus, 0.5 x 1.3 to 2.6 um
• Short stumpy rods that are a little thicker at one end than at the other
• In exudates and cultures, organism in clumps
• Non-motile, non-sporeforming, non-capsulate
• Strongly gram-positive, with bars and granules when stained with methylene blue
• Pili present but fewer in C. renale

Question 16

Describe the colonies of C. renale.

Answer 16

Colonies opaque, ivory-colored and dull with uneven margins

Question 17

Describe the colonies of C. pilosum.

Answer 17

Cream colored to pale yellow, circular; Opaque above 1 mm in diameter

Question 18

Describe the colonies of C. cystitidis.

Answer 18

White, entirely circular, semitranslucent and pinpoint

Question 19

Describe C. renale in litmus milk.

Answer 19

Reduction in the bottom of the tube then formation of soft curd which is slowly digested; medium alkaline at all times; medium separates into dark red fluid and heavy sentiment

Question 20

Between the three types, which produces caseinase?

Answer 20

C. renale

Question 21

Choose between the three: (1) C renale, (2) C. pilosum, and (3) C. Cystitidis.

*Most frequently isolated from cases of pyelonephritis

Answer 21

C. renale

Question 22

Choose between the three: (1) C renale, (2) C. pilosum, and (3) C. Cystitidis.

*Occurs in urine and vagina of healthy cows causing cystitis and vaginitis occassionaly.

Answer 22

C. pilosum

Question 23

Choose between the three: (1) C renale, (2) C. pilosum, and (3) C. Cystitidis.

*Causes severe hemorrhagic cystitis followed by pyelonephritis; commensal on prepuce of bulls; disease involves urinary bladder including one or both ureters and one or both kidneys

Answer 23

C. cystitidis

Question 24

_____ _____ believed to be caused by irritating effect of ammonia released by urease from C. renale in the prepuce.

Answer 24

Ovin posthitis (pizzle rot)

Question 25

How can you be immunized against all three types of C. renale?

Answer 25

1. Serum antibody response in cows with pyelonephritis and urethritis but not with cystitis alone
2. Protective response of host ineffective and untreated animals seldom recover

Question 26

What are the diagnoses for C. renale?

Answer 26

1. Characteristic symptoms
2. Blood clots and bits of necrotic tissue in urine - Gram stain

Question 27

Give the antimicrobial susceptibility of C. renale. (sensitive to?)

Answer 27

Sensitive to:
1. Penicillin
2. Streptomycin
3. Kanamycin
4. Erythromycin
5. Polymyxin B

Question 28

The antibiotic of choice of C. renale is ?

Answer 28

Penicillin in large doses

Question 29

Other term for C. pseudotuberculosis.

Answer 29

1. C. ovis
2. Preisz-Nocard bacillus

Question 30

C. pseudotuberculosis causes ______ ______ prevalent in sheep, goats, horses, camels, mules, and rarely in cattle and humans.

Answer 30

Caseous lymphadenitis