Abstract
The aim of this study was to investigate the antibiotic susceptibility profiles and the presence of extended-spectrum-β-lactamases (ESBLs) in Pseudomonas fluorescens isolates from coastal waters of the Kaštela Bay, Croatia. Twenty-two water samples were collected during 2009. Isolates were tested for susceptibilities to 13 antibiotics by Etest. ESBL production was confirmed by double-disk synergy test carried out on Mueller–Hinton agar plates containing efflux pump inhibitor Phe-Arg-β-naphthylamide dihydrochloride. PCR and DNA sequencing analysis were used to identify ESBL-encoding genes. The transferability of cephalosporin resistance was tested by conjugation experiments. Genetic relatedness of ESBL-producing isolates was determined by random amplified polymorphic DNA (RAPD) analysis. Out of 185 P. fluorescens isolates recovered, 70 (37.8%) demonstrated multiresistance phenotype with highest rates of resistance to tetracycline (61.6%), aztreonam (31.9%), meropenem (17.3%), ceftazidime (15.1%) and cefotaxime (12.4%). Ten (5.4%) isolates were identified as ESBL producers. All isolates carried chromosomally located bla TEM-116 gene. RAPD analysis identified four different genotypes. Here, we demonstrated a baseline profiles of antimicrobial resistance of P. fluorescens from coastal waters of the Kaštela Bay, Croatia. To our knowledge, this is the first report of the presence of TEM-type ESBL in P. fluorescens, indicating this bacterium as a reservoir of antibiotic resistance genes with clinical relevance.
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Acknowledgment
This work was supported by Ministry of Science, Education and Sports, Republic of Croatia, project “Faecal indicator and potential pathogens in coastal and marine waters“, Grant 177-0000000-3182 and project “Mechanisms of maintenance genome stability in higher plants”, Grant 177-1191196-0829.
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Maravić, A., Skočibušić, M., Šamanić, I. et al. Antibiotic susceptibility profiles and first report of TEM extended-spectrum β-lactamase in Pseudomonas fluorescens from coastal waters of the Kaštela Bay, Croatia. World J Microbiol Biotechnol 28, 2039–2045 (2012). https://doi.org/10.1007/s11274-012-1006-5
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DOI: https://doi.org/10.1007/s11274-012-1006-5