Corynebacterium Flashcards
PATHOGENICITY Normal on skin & mucous membranes. Opportunistic pathogens.
Corynebacterium
Irregular, slightly curved, nonparallel sides, club-shaped ends. Chinese letter or picket fence formation (palisades).
Corynebacterium
Corynebacterium:
Catalase / motility
(+) (non motile)
Causes diphtheria
C. diphtheriae
Gray-black colonies with brown halos on Tindale agar.
C. diphtheriae
Black colonies on cystine tellurite.
C. diphtheriae
Loeffler medium stimulates growth & production of metachromatic granules.
C. diphtheriae
ID requires demonstration of toxin production. Modified Elek immunoprecipitation test.
C. diphtheriae
C. diphtheriae
catalase / motility / toxin
(+) (non motile) (+)
C. diphtheriae:
Tinsdale / Cysteine tellurite / Loeffler
Brown halo / Black colonies / Metachromatic granules
Non sporeforming gram (+) rod
Corynebacterium
Listeria
Nocardia
Hospital-acquired pathogen.
C. jeikeum
C. jeikeum:
Catalase / RSU
(+)(-)
Most commonly isolated diphtheroid. Highly resistant to antibiotics.
C. jeikeum
