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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
immunology and microbiology
Prevalence and diversity of carbapenem-resistant bacteria in untreated drinking water in Portugal
Microbial Drug Resistance, Volume 18, No. 5, Year 2012
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Description
We examined the prevalence and diversity of carbapenem-resistant bacteria (CRB) in untreated drinking water. Prevalence was estimated in plate count agar (PCA) and R2A media with or without antibiotics. Clonal relatedness of isolates was established by repetitive extragenic palindroitic (REP)-PCR. Phylogeny was based on the 16S rRNA gene. Antimicrobial susceptibility was assessed by disc diffusion methods. Genes encoding betalactamases and integrases were inspected by PCR. CRB ranged from 0.02% to 15.9% of cultivable bacteria, while ampicillin-resistant bacteria ranged from 1.5% to 31.4%. Carbapenem-resistant isolates affiliated with genera Stenotrophomonas, Pseudomonas, Janthinobacterium, Chryseobacterium, Sphingobacterium, Acidovorax, Caulobacter, Cupriavidus, and Sphingomonas. CRB were highly resistant to beta-lactams, but mostly susceptible to other classes. Transmissible beta-lactamase genes and integrase genes were not detected. The genus-specific blaL1 was detected in 61% of the Stenotrophomonas isolates. Contrarily to what has been reported for extensively used antibiotics, low levels of carbapenem resistance were detected in untreated drinking water, often represented by intrinsically resistant genera. Production of chromosomal-encoded carbapenemases was the prevalent carbapenem resistance mechanism. Results suggest that the dissemination of anthropogenic-derived carbapenem resistance is at an early stage. This presents an opportunity to rationally develop monitoring strategies to identify dissemination routes and assess the impact of human actions in the environmental resistome. © Mary Ann Liebert, Inc.
Authors & Co-Authors
Henriques, I. S.
Portugal, Aveiro
Universidade de Aveiro
Araújo, Susana M.
Portugal, Aveiro
Universidade de Aveiro
Azevedo, Juliana S.N.
Portugal, Aveiro
Universidade de Aveiro
Alves, Marta Salgueiro
Portugal, Aveiro
Universidade de Aveiro
Chouchani, Chedly
Tunisia, Tunis
University of Carthage
Pereira, Anabela O.
Portugal, Aveiro
Universidade de Aveiro
Correia, António C.M.
Portugal, Aveiro
Universidade de Aveiro
Statistics
Citations: 34
Authors: 7
Affiliations: 2
Identifiers
Doi:
10.1089/mdr.2012.0029
ISSN:
10766294
e-ISSN:
19318448
Research Areas
Environmental
Genetics And Genomics
Study Design
Cross Sectional Study