II. Characteristics
- Facultative Anaerobic Gram Negative Rods
III. Types: EKP Gram Negative Bacteria
- Escherichia coli
- Klebsiella
- Proteus
IV. Types: ESP Gram Negative Bacteria
- Enterobacter (Aerobacter)
- Serratia
- Providencia (often grouped with Proteus)
V. Types: SS Gram Negative Bacteria
VI. Types: Other Enterobacteriaceae
- Citrobacter (Escherichia freundii)
- Morganella
- Yersinia
- Erwinia