3.3.EX Lab diag (Gram positive bacilli) Flashcards
Cellular morphology:
Gram +
Branching filamentous rods
Colonial morphology:
White
Opaque
“Molar tooth” resemblance
Actinomyces israelii
Cellular Morphology:
Diphtheroid
End of the cell may be pointed (Fusiform), bent, club shaped, spatulated, etc.
“Dog bones”
“Starlike aggregates”
“V or Y arrangements / Palisade”
Colonial appearance:
Small
Cream-white
Convex
Shiny with irregular edge
Bifidobacterium spp.
48 hr colony <1mm (+)
Rough colony (+)
Branched bacilli (+)
Catalase (-)
Indole (-)
Molar tooth colony
Actinomyces israelii
48 hr colony <1mm (-)
Rough colony (-)
Branched bacilli (-)
Catalase (-)
Indole (-)
Rod w/ forked ends
Bifidobacterium spp.
48 hr colony <1mm (-)
Rough colony (-)
Branched bacilli (-)
Catalase (+)
Indole (+)
Propionibacterium acnes