Differentiation of Aeromonas from Vibrio and Plesiomonasa

OrganismGrowth on substratePresence of enzymeFermentation of myo-inositol
Growth on 0% NaClbO129Growth on TCBSLDCADHODC
Aeromonas speciesGrRNGr++
Vibrio cholerae/V. mimicus GrScYellow colony/green colony++
Other vibriosNGrPSYellow or green colony++
Plesiomonas shigelloides GrR/SNGr++++
  • a Abbreviations: O129, vibriostatic agent 2,4-diamino-6,7-diisopropylpteridine; LDC, lysine decarboxylase; ADH, arginine dihydrolase; ODC, ornithine decarboxylase; Gr, growth; NGr, no growth; R, resistant; S, sensitive; PS partially sensitive.

  • b Difco nutrient broth, contains no trace of NaCl.

  • c Infrequent strains of V. cholerae serogroup O1 and all strains of serogroup O139 are resistant.