Improved laboratory enrichment for enterohemorrhagic Escherichia coli by exposure to extremely acidic conditions.

Abstract:

:Analysis of food samples for E. coli O157:H7 using the standard U.S. Food and Drug Administration procedure is frequently complicated by overgrowth of nontarget microorganisms. A new procedure was developed for enrichment of enterohemorrhagic E. coli (EHEC) which utilizes exposure to pH 2.00 for 2 h. This procedure yielded larger populations of EHEC than the standard method by factors ranging from 2.7 to 7.7 and, when age-stressed cultures were used, by factors ranging from 2.7 to 11.5. Cultures of competing enterics were more effectively inhibited by the new enrichment protocol as well.

journal_name

Appl Environ Microbiol

authors

Grant MA

doi

10.1128/aem.70.2.1226-1230.2004

keywords:

subject

Has Abstract

pub_date

2004-02-01 00:00:00

pages

1226-30

issue

2

eissn

0099-2240

issn

1098-5336

journal_volume

70

pub_type

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