MICROBIAL QUALITY ASSESSMENT OF SOME FRUITS OBTAINED FROM RETAIL OUTLETS IN ZARIA, KADUNA STATE, NIGERIA
Abstract
Fruits are an essential component of a balanced diet, providing vital nutrients for human health. However, due to their high moisture content and frequent exposure to environmental contaminants, they are susceptible to microbial contamination, posing serious public health risks. This study aimed to assess the microbial quality of selected fruits (pawpaw, watermelon, and pineapple) obtained from retail outlets in Zaria, Kaduna State, Nigeria. A cross-sectional study was conducted in three major retail locations: Samaru, Kwangila, and PZ. Fruit samples were randomly collected and analyzed using standard microbiological techniques to determine the total bacterial and fungal loads. Microbial isolates were identified through biochemical and morphological characterization, while antimicrobial susceptibility testing was performed using the Kirby-Bauer disc diffusion method. Pathogenicity tests were also conducted to assess the spoilage potential of fungal isolates. The results revealed high microbial contamination across all fruit samples, with pawpaw and watermelon exhibiting the highest bacterial and fungal loads. The most frequently isolated bacteria were Escherichia coli, Staphylococcus aureus, Bacillus spp., Salmonella spp., Proteus vulgaris, and Shigella spp., indicating potential fecal contamination and inadequate hygiene practices. Fungal isolates included Aspergillus niger, Aspergillus flavus, Penicillium spp., Candida spp., Mucor spp., and Rhizopus spp., with Aspergillus species being the most prevalent. Antimicrobial susceptibility testing revealed multi-drug resistance in Escherichia coli and Proteus vulgaris, highlighting a growing public health concern. These findings emphasize the need for improved hygiene measures in fruit handling, storage, and retail distribution. Proper washing, disinfection, and adherence to food safety regulations should be enforced to reduce microbial contamination. Additionally, public awareness campaigns on the risks associated with consuming unwashed fruits should be promoted. Further research is recommended to explore long-term t
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