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Appl Environ Microbiol. 1982 May; 43(5): 1111-1115

Salmonella spp. in the working environment of sewage treatment plants in Oslo, Norway.

ABSTRACT

The presence of Salmonella spp. was investigated at three sewage treatment plants in Oslo, Norway. Salmonella bacteria were isolated from floor surfaces and areas with hand contact in the treatment plant, from floor surfaces and areas with hand contact in the treatment plant, from floor surfaces in the changing rooms, and in one case from floor surfaces in an eating room. The sewage sludge contained from 140 to 140,000 Salmonella spp. per 100 g dry weight. Raw and treated sewage contained an average of 130 and 3 of these bacteria per 100 ml, respectively. There was poor correlation between the pattern of serotypes isolated from the sewage works and the patterns of those which were registered among the population of Oslo during the investigation. Neither enteropathogenic bacteria nor parasite eggs were found in fecal samples from employees at the plant. The health significance of the presence of Salmonella spp. in the environment of sewage workers is discussed.