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The study was carried out on water samples collected from different sites in Swakin City and Arbat area in Sudan. Five samples were collected during two seasons (winter and summer) to determine the quality of the drinking water by looking into physicochemical and microbial aspect. Results showed that some samples exceeded the Sudanese and international standards in turbidity and some samples showed the presence of coliform, E. coli and faecal streptococcus bacteria. It is recommended to carry out microbial examination frequently for water in the distribution system.

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In this study, a total of 25 Lactic Acid Bacteria (LAB) isolates from 15 samples [4 burgers, 4frankfurters, 3 pastramis, 2 sausages and 2baby faeces] were screened for their ability to produce inhibitory substances against three microorganisms which were isolated from meat products: (Salmonella typhi, Staphylococcus aureus and Escherichia coli). Other indicators (reference target organisms) were obtained from the Central Public Health Laboratory, Khartoum State, Sudan. These were: Salmonella typhi ATCC14023, Staphylococcus aureus ATCC29213 and Escherichia coli ATCC25922. The antagonistic activities of the isolates were screened by the direct spot-on-lawn method and well- diffusion method. A total of 25 isolates of LAB were obtained, 15 of which produced promising inhibition zones against all or some of the indicator bacterial strains.