The authors regret that there was an incorrect citation in their original paper and apologise for any inconvenience caused. The citation and accompanying reference have now been removed from the paper and the updated sentence is given below:

The mean concentration of faecal coliforms in water samples from River Ala appeared to be higher than those obtained by Abdul et al. (2007) where the authors reported a mean range of 1.46–2.47 log10 CFU 100 ml−1 in river water samples obtained from Khairpur City, Sindh, Pakistan.

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