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[Comparison of 3 methods for determining sensitivity to imipenem and meropenem in Acinetobacter baumannii with a carbapenem-heteroresistant phenotype].

Abstract：

INTRODUCTION:We assessed agreement among 3 assays for determining susceptibility to imipenem (IMP) and meropenem (MPM) of Acinetobacter baumannii (Ab) heteroresistant to carbapenems (Hr-CP). METHODS:Thirty Ab clinical isolates belonging to 6 clones (REP-PCR) were studied, in which IMP and MPM MICs were between < or = 1 and > or = 8 mg/l by Wider system. MICs determined by Wider were compared with those obtained by microdilution (MD) and E-test. Errors in the clinical category were determined considering MD as the reference method. RESULTS:Twenty-five Ab were Hr-CP (growth of resistant colonies within the inhibition area of disks and E-test strips). Agreement for the MICs (+/- 1log(2)) in Hr-CP colonies was as follows: Wider vs. MD (96% IMP, 100% MPM), Wider vs. E-test (50% IMP, 64% MPM), MD vs. E-test (64% IMP, 60% MPM). Major errors were not observed. Minor errors and moderate errors for IMP included Wider vs. MD (40% and 0%), E-test vs. MD (40% and 12%), and disks vs. MD (36% and 8%). Agreement for the MICs considering colonies growing within the inhibition areas (E-test and disks) was Wider vs. E-test (8% IMP, 12% MPM), and MD vs. E-test (8% IMP and MPM). Major errors were not observed in this case either; minor errors and moderate errors for IMP were seen in E-test vs. MD (40% and 48%), and disks vs. MD (40% and 48%). CONCLUSION:Susceptibility testing methods based on microdilution (Wider system and MD) are not useful to detect subpopulations of Ab Hr-CP.

journal_name

Enferm Infecc Microbiol Clin

journal_title

Enfermedades infecciosas y microbiologia clinica

authors

Fernández-Cuenca F,Egea P,López-Cerero L,Díaz-De Alba P,Vila J,Pascual A

subject

Has Abstract

pub_date

2008-10-01 00:00:00

pages

485-8

issue

8

eissn

0213-005X

issn

1578-1852

pii

S0213-005X(08)72775-7

journal_volume

26

pub_type

杂志文章

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