Journal of Antimicrobial Chemotherapy, Vol 42, 661-663, Copyright © 1998 by The British Society for Antimicrobial Chemotherapy
IJ Hassan, RM Stark, J Greenman and MR Millar
A continuous culture system (chemostat) was used to study the post-
antibiotic effect (PAE) of beta-lactams, against slowly-growing
Helicobacter pylori NCTC 11637. H. pylori was grown at one quarter of its
maximum specific growth rate (mu(max)) before exposure to ampicillin,
amoxycillin, azlocillin, piperacillin or cefixime (8 x MIC). After 8 h, the
antibiotics were inactivated. Viable counts were used to determine the rate
of recovery of H. pylori. The recovery growth rate of H. pylori was similar
to the maximum growth rate of H. pylori under antibiotic-free experimental
conditions, so none of the beta-lactams studied showed a PAE against
slowly-growing H. pylori.
ORIGINAL ARTICLES
Absence of a post-antibiotic effect (PAE) of beta-lactams against Helicobacter pylori NCTC 11637
Pathology and Microbiology Department, University of Bristol, UK. I.J.Hassan@bristol.ac.uk
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