Abstract

Following our observation that Aeromonas spp. grow on Cefsulodin-Irgasan-Novobiocin (CIN) agar (Altorfer et al., Ahstr. A. Meet. Am. Soc. Microbiol. (1985)) we looked for the presence of Aeromonas spp. in stool specimens using CIN medium during 3 months in summer 1984. From 1282 specimens plated on CIN directly and after enrichment in PBS and Rappaport broth (the same procedur as used for recovery of yersiniae) 31 strains of Aeromonas spp. were isolated (2.4%). In addition, one strain from water was found. Of these 32 strains, 21 were A. eaviae, 5 were A. sobria, 1 was A. hydrophila, and 5 were atypical isolates. These findings were surprising in two ways: 1) A. caviae, our most frequent isolate, is often considered not to be pathogenic, 2) most of our isolates were from patients with intestinal disorders from whom no other enteropathogenic organisms could be isolated. So far, the role of Aeromonas spp. in diarrheal disease is controversial, but our results imply a clinical significance of isolates of all three species.

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