A. aquariorum A. allosaccharophila A. aquatica[1] A. australiensis A. bestiarum A. bivalvium A. caviae A. dhakensis[1] A. diversa A. encheleia A. enteropelogenes A. eucrenophila A. finlandensis[1] A. fluvialis A. hydrophila A. jandaei A. lacus[1] A. media A. molluscorum A. piscicola A. popoffii A. punctata A. rivipollensis[1] A. rivuli A. salmonicida A. sanarellii A. schubertii A. sharmana A. simiae A. taiwanensis A. tecta A. veronii Aeromonas is a genus of Gram-negative, facultative anaerobic, rod-shaped, bacteria that morphologically resemble members of the family Enterobacteriaceae.

Gastrointestinal disease in children is usually an acute, severe illness, whereas that in adults tends to be chronic diarrhea.

[11] Most commonly, this has been reported with A. hydrophila, though the ability of clinical laboratories to correctly identify species of Aeromonas has been limited.

In response to these studies, the Environmental Protection Agency (EPA) in the United States removed Aeromonas from the contaminant candidate list (CCL) in 2009.

Drinking water companies limit the multiplication of bacteria, protozoans and invertebrates (all natural parts of drinking-water distribution systems [13]).

The authorities in the Netherlands included Aeromonas in the Dutch Drinking Water Decree as an additional operational indicator (beside heterotrophic plate count [HPC]) for microbial regrowth, limited to 1,000 CFU/100 ml, obtained by growth on specific ampicillin-dextrin agar plates at 30 °C.

Another field study in the Netherlands showed that noncompliance with the Aeromonas standard in two distribution systems coincided with increased HPCs (within the limits of the Dutch Drinking Water Decree), occasional coliform regrowth, and enhanced numbers of macroinvertebrates (e.g., water lice).

Furthermore, it has been observed that Aeromonas isolates are mainly associated with sediment in the distribution system and to a lesser extent with drinking water, but not with the biofilm on the pipe wall, demonstrating that sediment or loose deposits (consisting of small and larger [in]organic and biological suspended solids, including invertebrates) are the main niche for Aeromonas.