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Asian Journal of Applied Sciences
Year: 2019  |  Volume: 12  |  Issue: 2  |  Page No.: 85 - 90

Evaluation of Pathogenic Bacteria in Packaged Milk Products Sold in Sokoto Metropolis, Nigeria

M.I.O. Raji and M.H. Jiya    

Abstract: Background and Objective: Packaged milk products mostly being referred to as yogurts are fermented milk products produce by bacteria fermentation of milk and are being consumed all over the world. Fermented milk products are liable to microbial contamination as well as the fresh milk from which they are produced and consumption of contaminated milk is of great health risks. The current study investigated pathogenic bacteria contaminating packaged milk products sold in Sokoto metropolis, Nigeria in order to create awareness for people on the inherent health risks associated with consumption of contaminated milk products. Materials and Methods: Twenty seven packaged milk product samples were bought from three different locations (9 samples for each location) in Sokoto metropolis and analyzed. The bacterial load of packaged milk samples obtained by standard plate count method showed that Brand 2 milk samples from Runjin Sambo area had the highest counts ranging from 24.0-368.0×106 CFU mL–1. Isolation of bacteria was achieved by culturing on different selective media while identification of the isolated bacteria was done by cellular morphology under a light microscope, colonial morphology on selective media and biochemical tests. Results: Forty five pathogenic bacteria comprising 9 different species namely: Salmonella spp., Shigella spp., E. coli, Serratia spp., Providencia spp., Pseudomonas spp., Enterobacter spp., Staphylococcus aureus and Bacillus subtilis were identified from the milk samples. Majority of the pathogenic bacteria were Gram-positive organisms with 30.4% Bacillus subtilis and 21.8% Staphylococcus aureus. Among Gram-negative organisms, E coli had the highest percentage of 15.2%. Conclusion: The findings of the study showed that packaged milk products sold in certain areas of Sokoto metropolis contained pathogenic bacteria and therefore, pose a serious health risk to the consumers. To ensure proper quality of packaged milk products, there should be a thorough check and control on the methods through which milk products are being produced and sold in local markets and major streets.

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