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Resistance to antibiotics to heavy metal-tolerant and heavy metal-sensitive bacterial strains


, : Resistance to antibiotics to heavy metal-tolerant and heavy metal-sensitive bacterial strains. Journal of Environmental Science & Health Part A Environmental Science & Engineering 28(1): 203-215

Seventy-three bacterial isolates from polluted streams as well as 157 of their heavy metal-tolerant (HM-tolerant) derivatives were tested for their sensitivity to ampicillin, ticarcillin, gentamicin, cephalexin, sulfamethoxazole, tetracycline and colistin. Among the parent strains 19% were sensitive to all antibiotics tested and 70% were multiple resistant. The mean resistance of parent strains was 2.27 antibiotics per isolate. Mean resistance was increased to 2.82 for silver-, 3.32 for gold-, 3.48 for copper-, 3.78 for nickel-, and 3.79 for cadmium-tolerant subcultures. A statistically significant increase in resistance was demonstrated for tetracycline and sulfamethoxazole in all HM-tolerant subcultures, for cephalexin in gold-, nickel- and cadmium- tolerant strains, for ampicillin in gold-tolerant isolates and for ticarcillin in cadmium-tolerant strains.

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