FIG 2.

Microbiological analysis of different types of irrigation water, namely, groundwater from a borehole and collected rainfall water stored in a pond without protection, in a pond with a plastic foil covering the bottom, and in a raised pond (elevated edges to prevent runoff) with a plastic foil bottom. Different letters indicate statistically significant differences, and n indicates the ratio of the number of positive results to the total number of samples. (A) Mean generic E. coli concentrations (log CFU/100 ml) with error bars indicating the standard deviations of the data from the positive samples. (B) STEC prevalence (%) with error bars indicating the 95% CI for the prevalence estimate.