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Antibiotic Susceptibility Profiles and First Report of TEM Extended-Spectrum β-lactamase in Pseudomonas Fluorescens From Coastal Waters of the Kaštela Bay, Croatia

Antibiotic Susceptibility Profiles and First Report of TEM Extended-Spectrum β-lactamase in Pseudomonas Fluorescens From Coastal Waters of the Kaštela Bay, Croatia

Ana Maravić, Mirjana Skočibušić, Ivica Samanić, Jasna Puizina

World J Microbiol Biotechnol. 2012 May;28(5):2039-45.

PMID: 22806025

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP100929995	Phe-Arg β-naphthylamide dihydrochloride		100929-99-5	Price

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