Corynebacterium

Question 1

spore

Answer 1

non spore forming

Question 2

pathogenesis

Answer 2

tissue trauma
infection
suppurative lesion

Question 3

gram

Answer 3

positive

Question 4

pleomorphic?

Answer 4

yes

Question 5

fastidious?

Answer 5

yes
requires enriched media

Question 6

commensals on mucus membranes?

Answer 6

yes, majority

Question 7

pyogenic infection?

Answer 7

yes

Question 8

motility

Answer 8

non motile

Question 9

respiration

Answer 9

facultative anaerobe

Question 10

catalase

Answer 10

positive

Question 11

oxidase

Answer 11

negative

Question 12

c bovis disease

Answer 12

subclinical mastitis in cow – teat cistern

Question 13

c diphtheriae disease

Answer 13

diphtheria in humans –pharyngeal mucosa
rare cases of wound infection in horses – human pharyngeal mucosa

Question 14

c kutscheri disease

Answer 14

superficial abscess, caseopurulent foci in liver/lungs/lymph nodes in lab rodents – mucous membranes, environment

Question 15

c pseudotuberculosis, non nitrate reducing disease

Answer 15

caseous lymphadenitis in sheep/goat – skin, mucous membranes, environment

Question 16

c pseudotuberculosis, nitrate reducing disease

Answer 16

caseous lymphadenitis, abscess in horse/cow – environment

Question 17

c renal I disease

Answer 17

cystitis, pyelonephritis in cow – lower urogenital tract
ulcerative (enzootic) balanoposthitis in sheep/goat – prepuce

Question 18

c renale II disease

Answer 18

cystitis, pyeloneprhitis in cow – bovine urogenital tract

Question 19

c renale III disease

Answer 19

severe cystitis, rarely pyelonephritis in cow – bovine urogenital tract

Question 20

c ulcerans

Answer 20

mastitis in cow – human pharyngeal mucosa
upper respiratory infections in cat – humans pharyngeal mucosa
diphtheria (toxigenic strains) in humans – human pharyngeal mucosa

Question 21

c bovis colonies

Answer 21

small
white
dry
non hemolytic

Question 22

c kutscheri colonies

Answer 22

whitish
occasional isolates are hemolytic

Question 23

c pseudotuberculosis colonies

Answer 23

small
whiteish
surrounded by narrow zone of complete hemolysis
after several days – dry, crumbly, cream colored

Question 24

c renale colonies

Answer 24

small
non hemolytic

Question 25

pathogenesis

Answer 25

opportunistic pathogens
pyogenic organisms – suppurative conditions

Question 26

diagnosis

Answer 26

clinical signs
samples – pus, exudate, tissue, urine
gram stained smears
culture – blood agar, MacConkey agar
PCR