- Enterobacteriaceae is a family of facultative Anaerobic Gram Negative Rods
- EKP Gram Negative Bacteria
- ESP Gram Negative Bacteria
- Enterobacter (Aerobacter)
- Serratia Marcescens
- Providencia (often grouped with Proteus)
- SS Gram Negative Bacteria
- Shigella
- Salmonella (non-typhoid, or Typhoid Fever)
- Other Enterobacteriaceae
- Citrobacter (Escherichia freundii)
- Morganella
- Yersinia enterocolitica
- Yersinia pestis
- Erwinia