Forty-one strains of enteroaggregative Escherichia coli formed clumps visible as a scum at the surface of a Mueller-Hinton broth shaker culture. Sixty-one control strains of E. coli did not. Scum formation is a simple, rapid, and inexpensive test for the identification of enteroaggregative E. coli.
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Albert et al. (1993) studied this question.