- Gram-negative bacillus, facultative anaerobe. Ubiquitous water organism.
- Oxidase positive, lactose-fermenting, motile with flagella (Figure).
- Cytochrome oxidase, catalase and indole positive.
- Able to ferment maltose, D-galactose and trehalose.
- Found in warmer climes, primarily fresh or brackish waters.
- May contaminate food, especially fish.
- A. hydrophila is the most common and important human pathogen, also A. caviae and A. veronii biovar sobria.
- A. caviae and A. veronii biovar sobria leading Aeromonas spp. causing travelers diarrhea.
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