Evans DJ, Evans DG. Three characteristics associated with enterotoxigenic Escherichia coli isolated from man.
Infect Immun 1973;
8:322-8. [PMID:
4581006 PMCID:
PMC422851 DOI:
10.1128/iai.8.3.322-328.1973]
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Abstract
In Dacca, Bangladesh, potent enterotoxin-producing Escherichia coli were isolated from many hospital cases of acute cholera-like diarrhea. Enterotoxigenic (tox(+)) and non-enterotoxigenic (tox(-)) isolates of E. coli were used to investigate possible means of differentiating tox(+)E. coli from those (tox(-)) of the normal flora. The majority (81%) of the tox(+)E. coli studied were found to be negative for sucrose fermentation, 85% exhibited retarded growth in a peptone medium at pH 8.5, and 92% released large amounts of ammonium sulfate precipitable materials into culture supernatant fluids; 66.6% exhibited all three of these properties. For the tox(-) group the respective values were found to be 50%, 31%, and 34%; only 9.3% exhibited all three properties. These results indicate that it may be possible to use phenotypic characteristics other than antigenic composition and enterotoxin production for the identification of enterotoxigenic E. coli.
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