Dichotomous Keys
For The Identification of Bacteria
Bacteria Identification Key:
This identification key can be used to differentiate the
following species of bacteria commonly isolated in the
clinical laboratory. This key is for educational purposes
only, and is not intended to be an exhaustive resource for
the identification of all bacteria.
  • E. coli
  • B. cereus
  • S. aureus
  • S. epidermidis
  • E. faecalis
  • S. pyogenes
  • S. pneumonia
  • P. aeruginosa
  • K. pneumonia
  • P. mirabilis
  • S. flexneri
  • S. typhimurium