Gram-Negative Organisms Recovered From Culture
|Aerobic, gram-negative cocci (GNC)|
- Gram-negative diplococci (pairs) with adjacent sides flattened (coffee bean shaped)
|Aerobic, gram-negative rods (GNRs) and coccobacilli|
- Pseudomonas: Straight, slender, gram-negative rods (GNRs).
- H. influenzae: Small , pale staining, coccobacilli or short GNRs.
- B. fragilis: Pale-staining, pleomorphic rods with rounded ends.
- F. nucleatum subspecies nucleatum: Pleomorphic GNRs with round to tapered ends.
|Facultative anaerobic GNRs||Enterics (eg, Escherichia, Klebsiella, Proteus, Enterobacter, Salmonella, Shigella)|
- Typically, the enterics are plump GNRs.
- There is not a unique morphology that can be used to distinguish between the enteric organisms.