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The phenotypic characteristics of 89 Aeromonas strains, most of which had been isolated from feces, were examined. Eighty-two percent of the isolates could be placed into one of four groups on the basis of five tests. The relationship of these groups to the three motile species of Aeromonas (Aeromonas caviae, A. hydrophila, and A. sobria) that have been isolated from humans is unclear. Because the means for identification of Aeromonas strains to the species level appear to be imprecise and because the role of each of these species in human diarrhea is unclear at this time, we recommend that identification of enteric Aeromonas isolates to the species level not be done routinely.

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