Fig. 3From: Comparison of coliform contamination in non-municipal waters consumed by the Mennonite versus the non-Mennonite rural populationsColilert reagent for detection of total coliforms and E. coli [21, 23]. The mixture of Colilert reagent and water sample turns yellow if any coliform bacteria are present and yellow plus fluorescent if specifically E. coli is present (color figure online)Back to article page