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. 1989 Feb;55(2):335–339. doi: 10.1128/aem.55.2.335-339.1989

Proportion of beta-D-glucuronidase-negative Escherichia coli in human fecal samples.

G W Chang 1, J Brill 1, R Lum 1
PMCID: PMC184111  PMID: 2655534

Abstract

Convenient assays and reports that almost all clinical isolates of Escherichia coli produce beta-D-glucuronidase (GUR) have led to great interest in the use of the enzyme for the rapid detection of the bacterium in water, food, and environmental samples. In these materials, E. coli serves as an indicator of possible fecal contamination. Therefore, it was crucial to examine the proportion of GUR-negative E. coli in human fecal samples. The bacterium was isolated from 35 samples, and a mean of 34% and a median of 15% were found to be GUR negative in lauryl sulfate tryptose broth with 4-methylumbelliferyl-beta-D-glucuronide. E. coli from three samples were temperature dependent for GUR production: very weakly positive at 37 degrees C but strongly positive at 44.5 degrees C. These results remind us of differences between fecal and clinical E. coli populations, of diversity in GUR regulation and expression in natural populations of E. coli, and of the need for caution in using GUR for the detection of fecal E. coli.

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Selected References

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