Aeromonas is a topic covered in the Johns Hopkins ABX Guide.

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  • Gram-negative bacillus, facultative anaerobe member of Enterobacteriaceae. A ubiquitous organism, occurring in both fresh and brackish waters usually in warmer climates.
    • Oxidase positive but lactose-fermenting, motile with flagella (Figure).
      • Cytochrome oxidase, catalase and indole positive.
      • Able to ferment maltose, D-galactose and trehalose.
    • May contaminate food, especially fish.
  • A. hydrophila is the most common and important human pathogen, also A. caviae and A. veronii biovar sobria. Of 14 described species, all have been linked to human infection.
    • A. caviae and A. veronii biovar sobria leading Aeromonas spp. causing travelers diarrhea.
    • A. dhakensis: described as causing diarrhea in children (2002) may be misidentified in the lab by commercial systems as A. hydrophila, A. veronii, or A. caviae by commercial systems.

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Last updated: January 3, 2018