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Journal of Clinical Microbiology, May 1995, 1054-1059, Vol 33, No. 5
S Stacy-Phipps, JJ Mecca and JB Weiss
Infection with enterotoxigenic Escherichia coli (ETEC) is a common cause of
diarrhea among travelers and residents of developing countries. ETEC
produces either a heat-stable toxin or a heat-labile toxin, or both,
encoded by plasmid-borne ST and LT genes, respectively. Diagnosis of
infection with this subclass of E. coli can be performed with
oligonucleotide hybridization probes; however, the sensitivity and
specificity of this method are insufficient. A nonradioactive multiplex PCR
assay that provides a sensitive and specific method for detecting the
presence of either or both toxin genes has been developed. A simple
procedure that removed inhibitors of the PCR while efficiently releasing
ETEC DNA from stool specimens for subsequent amplification was used. The
results for samples from a human volunteer study of ETEC infection
indicated that this method of sample preparation results in greater
clinical sensitivity than conventional total nucleic acid extraction and
ethanol precipitation. Detection of ETEC by a multiplex PCR assay in stool
specimens directly processed with a glass matrix and chaotropic solution
had greater sensitivity than culture.
Copyright © 1995 by the American Society for Microbiology. All rights reserved.
Multiplex PCR assay and simple preparation method for stool specimens detect enterotoxigenic Escherichia coli DNA during course of infection
Department of Infectious Diseases, Roche Molecular Systems, Alameda, California 94501, USA.
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