Isolation and genotypic characterization of extended-spectrum beta-lactamase-producing Escherichia coli O157:H7 and Aeromonas hydrophila from selected freshwater sources in Southwest Nigeria.

Also, the mean values of the microbial populations for the samples collected at all three sites during the dry months generally exceeded those collected during the raining months, with highly significant differences for microbiological parameters such as HPC ( p = 0.0013), TC ( p = 0.0019), FC ( p = 0.0008) and A. hydrophila ( p = 0.0012).

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