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. 2006 Aug 22;3(8):e308. doi: 10.1371/journal.pmed.0030308

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© 2006 Ganoza et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Means and 95% CIs are shown. Open gutters and river samples showed significantly higher bacterial counts than the samples from puddles and underground sources (unpaired t-test with Welch's correction: t = 2.284, p < 0.05).