Salmonella pollution of surface waters

Area of Science:

• Environmental microbiology
• Water quality assessment
• Public health

Background:

• Salmonella contamination in surface waters poses a significant public health risk.
• Agricultural and sewage effluent are known sources of waterborne pathogens.
• Monitoring water bodies is crucial for understanding pathogen distribution.

Purpose of the Study:

• To investigate the prevalence of Salmonella in surface waters in Lancashire and Cheshire.
• To identify potential sources of Salmonella contamination in the selected water bodies.
• To discuss the implications for salmonellosis epidemiology and water treatment.

Main Methods:

• Surface water samples were collected from 14 sites, including reservoirs, rivers, and streams.
• Modified Moore's swabs were used for the isolation of Salmonella.
• Sites were selected based on their proximity to farm livestock.

Main Results:

• Salmonella was isolated from 22 out of 57 samples, representing 10 different sites.
• The presence of Salmonella suggests contamination from sewage or farm effluent.
• Similar contamination levels may be expected in a broader geographical area.

Conclusions:

• Surface waters in the study area are at risk of Salmonella contamination.
• Sewage and farm effluent are likely sources of this contamination.
• Findings underscore the importance of effluent disinfection and water quality monitoring to prevent salmonellosis.