Abstract

Municipal wastewater contains a high variety of pathogenic mi croorganisms than may present potential risks for public health and the enviro nment. We were interested in our study to isolate and study Salmonella in effluents throughout the wast ewater treatment plant process steps. The results showed the presence of Salmonella strains all along of the treatment steps and especially at its exit . A total of 19 Salmonella serotypes were identified in three wastewater types: raw water, decanted water a nd purified water. Despite of treatment, results revealed the presence of Salmonella strains in the purified water at the station exit. A high diversity of identified serotypes was noted. Antibiotic susceptibility showed that all Salmonella serotypes were susceptible to all antib iotics tested, except for one isolate of S . Chester and too isolates of S . Infantis strains which were multi-resistant and resistant only to nalidixic acid, respectively.