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Frequency of MUG Negative Escherichia coli in Kentucky Groundwater Samples

Dep. of Agronomy, N-122 Agric. Sci. Bldg. North, Univ. of Kentucky, Lexington, KY 40546-0091.

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ABSTRACT

MUG negative Escherichia coli are a small fraction (2.5%) of the total E. coli in Kentucky groundwater samples. It is unlikely that they alone will cause a significant potential to underestimate fecal contamination using MUG as the primary criterion for that assessment. An unresolved question is how effectively MUG-based, defined-substrate tests address false negative water samples containing MUG positive E. coli.