[Studies on motile-Aeromonas infection 3). Phage typing of motile Aeromonas isolated from patients with diarrhea].

Phage types were determined for 102 strains of motile Aeromonas isolated from patients with diarrhea at four metropolitan hospitals in Tokyo. The following results were obtained. 1) Of the 102 strains examined, 52 (51.0%) were divided into 28 phage types. This rate was considerably higher, compared to our previous results, namely, 21.7% for strains isolated from natural environments and 25% for those isolated from meats. By bacterial species, phage types could be determined for 33 (52.4%) of 63 strains of A. hydrophila, for 16 (45.7%) of 35 strains of A. sobria, 2 (50.0%) of 4 strains of A. caviae and 1 (100%) strain of Aeromonas spp. 2) Of the 52 strains for which the phage types could be determined, the greatest number (16 strains, 30.8%) were identified as belonging to Type I group. These are followed by 5 strains (9.6%) which were identified as Type I/III group and 2 strains (3.4%) each identified as Type I/II, I/II/V, IV, V and VI groups. The remaining 21 strains were identified as belonging to one of the other phage type groups. Thirty-five (67.3%) of the strains for which the phage types were identified, were found to belong either to Type I group or to combinations with Type I. This demonstrated that 34.0% of the isolates from patients with diarrhea were related to Type I.