Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/6904
Título: Antimicrobial resistance patterns inEnterobacteriaceae isolated froman urbanwastewater treatment plant
Autor: Silva, Miguel Ferreira da
Vaz-Moreira, Ivone
Gonzalez-Pajuelo, Maria
Nunes, Olga C.
Manaia, Célia M.
Palavras-chave: Enterobacteriaceae
Antibiotic Resistance
Disinfectants
Heavy metals
Class 1 integron
Data: 2007
Editora: Blackwell Publishing
Citação: SILVA, Miguel Ferreira da...[et al] - Antimicrobial resistance patterns in Enterobacteriaceae isolated from an urban wastewater treatment plant. FEMS Microbiology Ecology. ISSN 0168-6496. Vol. 60 (2007), p.166–176
Resumo: Over 18 months, enterobacteria were isolated from the raw (189 isolates) and treated (156 isolates) wastewater of a municipal treatment plant. The isolates were identified as members of the genera Escherichia (76%), Shigella (7%), Klebsiella (12%) and Acinetobacter (4%). Antimicrobial susceptibility phenotypes were determined using the agar diffusion method for the antibiotics amoxicillin, gentamicin, ciprofloxacin, sulfamethoxazole/trimethoprim, tetracycline and cephalothin, the disinfectants hydrogen peroxide, sodium hypochlorite, quaternary ammonium/formaldehyde and iodine, and the heavy metals nickel, cadmium, chromium, mercury and zinc. Class 1 integrons were detected by PCR amplification using the primers CS5 and CS3. Compared with the raw influent, the treated wastewater presented higher relative proportions of Escherichia spp. isolates resistant to ciprofloxacin and cephalothin (Po0.0001 and Po0.05, respectively). Except for mercury, which showed a positive correlation with tetracycline and sulfamethoxazole/trimethoprim, no significant positive correlations were observed between antibiotic, disinfectant and heavy metal resistance. The variable regions of class 1 integrons, detected in c. 10% of the Escherichia spp. isolates, contained predominantly the gene cassettes aadA1/dhfrI.
Peer review: yes
URI: http://hdl.handle.net/10400.14/6904
Versão do Editor: The definitive version is available at www.blackwell-synergy.com
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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