Abstract
The presence of high numbers of Aeromonas spp. is undesirable in the water supply, as they may be potentially pathogenic. Furthermore, they have a strong food spoilage potential. Aeromomas spp. have also been found in chlorinated drinking water where coliform counts were low. The present study was conducted to examine the level of and variation in chlorine resistance of Aeromonas spp. Two methods were employed. Screening of relative chlorine resistance was done on 46 clinical and 41 environmental isolates of Aeromonas spp. at 30° C, using a disc assay with four concentrations of hypochlorite, and results were compared with those of E. coli (3), Ps. fluorescens (2), Klebsiella spp. (1), Ps. aeruginosa (1), and Acinetobacter (1). Resistance varied greatly between Aeromonas isolates, but they were in general more susceptible than the other bacteria tested. Inactivation studies were conducted following the survival of selected isolates in solutions of monochloramine (0, 0.5, 1.0, and 2.0 mg/l) over a period of 180 minutes at pH 7.0 and 10° C. The most resistant strain in the disc assay was also the most resistant in the inactivation study.
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