Listeria monocytogenes: Prevalence and contamination profile in different categories of ready-to-eat foods within Ibadan metropolis, Oyo State, Nigeria
Keywords:
Ready-to-eat food, Listeria monocytogenes, Listeriosis, Food contaminationAbstract
The present investigation encompasses the incidence of Listeria monocytogenes in some ready-to-eat food samples, a human pathogen in the outbreak of listeriosis worldwide. A total of 104 food samples, comprising of chicken-pie, apple, shrimps, dried fish, fura, kilishi, salad and yoghurt were analyzed. Samples were tested using standard bacteriological methods to detect the presence of Listeria monocytogenes. Twenty-five suspected Listeria species were isolated from the samples except chicken pie, dried fish, yoghurt, and their percentage occurrence were 8% (kilishi), 28% (shrimps), 24% (fura), 32% (salad) and 8% (apple). Nineteen of these isolates showed α and β haemolysis, however, only 16 were positive to CAMP test, and as such, identified as L. monocytogenes. Shrimp had the highest number (6) of L. monocytogenes, followed by salad, with 5, fura had 4 and 1 from apple. The results indicated that some of the food samples analysed were contaminated with Listeria monocytogenes and posed a threat to consumers.
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