Very low cefotaxime concentrations select for hypermutable Streptococcus pneumoniae populations.

Abstract:

:A mixed culture of an hypermutable hexA Streptococcus pneumoniae mutant strain and its hexA(+) isogenic ancestor was challenged with low cefotaxime concentrations. Despite identical original cefotaxime MICs, the hexA mutant population was significantly selected at very low concentrations, and all of the tested selected variants harbored the Thr550-->Ala mutation in pbp2x. Since cefotaxime selects hypermutators, the risk of secondary acquisition of antibiotic resistance is increased; as expected, the cefotaxime-resistant mutants had a mutation frequency 10 times higher in response to to ciprofloxacin. The present study presents a model (not necessarily reflecting the clinical setting) illustrating the risk of selection of mutators in the evolution of multiple resistance.

authors

Negri MC,Morosini MI,Baquero MR,del Campo R,Blázquez J,Baquero F

doi

10.1128/aac.46.2.528-530.2002

subject

Has Abstract

pub_date

2002-02-01 00:00:00

pages

528-30

issue

2

eissn

0066-4804

issn

1098-6596

journal_volume

46

pub_type

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