Linezolid-resistant Staphylococcus haemolyticus and Staphylococcus hominis: single and double mutations at the domain V of 23S rRNA among isolates from a Rio de Janeiro hospital.

Autor: Chamon RC; Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil., Iorio NL; Universidade Federal Fluminense, Rio de Janeiro, Brazil., Cavalcante FS; Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil., Teodoro CR; Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil., de Oliveira AP; Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil., Maia F; Hospital Naval Marcilio Dias, Rio de Janeiro, Brazil., dos Santos KR; Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil. Electronic address: santoskrn@micro.ufrj.br.
Jazyk: angličtina
Zdroj: Diagnostic microbiology and infectious disease [Diagn Microbiol Infect Dis] 2014 Dec; Vol. 80 (4), pp. 307-10. Date of Electronic Publication: 2014 Sep 19.
DOI: 10.1016/j.diagmicrobio.2014.09.011
Abstrakt: In this work, the molecular and phenotypic antimicrobial resistance and clonal diversity of 10 linezolid-resistant Staphylococcus spp. isolates were investigated. The 7 Staphylococcus haemolyticus isolates presented Staphylococcal cassete chromosome mec (SCCmec) V and belonged to the same pulsed-field gel electrophoresis pulsotype. Their MICs for oxacillin, vancomycin, and linezolid were ≥ 256 μg/mL, 1-4 μg/mL, and 8-16 μg/mL, respectively. The 3 S. hominis presented MIC values 32 to >256 μg/mL, 2-4 μg/mL, and 12-24 μg/mL, and all carried the nontypeable SCCmec (ccr1 + mecA class) and belonged to 2 different genotypes. The cfr gene was not found, but the mutation G2603T was detected in S. haemolyticus and C2190T and G2603T in Staphylococcus hominis in 23S rRNA. This study demonstrates the spread of a linezolid-resistant S. haemolyticus genotype and, for the first time, describes the mutation C2190T among S. hominis isolates with a double mutation in Brazil.
(Copyright © 2014 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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