Antibiotic resistance of enterococci and related bacteria in an urban wastewater treatment plant

• Type: Article in International Scientific Journal
• Date: 2006

Authors

da Silva, MF (Author) Other; Tiago, I (Author) Other; Verissimo, A (Author) Other; Rui Boaventura (Author) FEUP; Olga C Nunes (Author) FEUP; Manaia, CM (Author) Other

Journal

Title: FEMS Microbiology Ecology

Vol. 55 No. 2

Pages: 322-329

ISSN: 0168-6496

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 126 Citations

ISI Web of Science

Scopus - 170 Citations

Scientific classification

CORDIS: Natural sciences

FOS: Natural sciences > Biological sciences

Other information

Authenticus ID: P-004-NDP

DOI: 10.1111/j.1574-6941.2005.00032.x

Abstract (EN): The main objective of this work was to study the ecology of enterococci and related bacteria in raw and treated wastewater from a treatment plant receiving domestic and pretreated industrial effluents in order to assess the influence of treatment on the prevalence of antibiotic resistance phenotypes among this group of bacteria. The predominant species found in the raw wastewater were Entercoccus hirae, Entercoccus faecium and Entercoccus faecalis. Wastewater treatment led to a reduction in E. hirae (alpha < 0.1) and an increase in E. faecium (alpha < 0.1); the relative proportions of E. faecalis remained the same in the raw and in the treated wastewater. Among the isolates tested, no vancomycin resistance was observed among the enterococci. Entercoccus faecium and E. faecalis showed resistance prevalence values reaching 33%, 40% and 57% for the antibiotics ciprofloxacin, erythromycin and tetracycline, respectively. Antibiotic-resistant strains of enterococci were not eliminated by wastewater treatment. A positive selection of ciprofloxacin-resistant enterococci was indicated by a significant increase in resistance prevalence (alpha < 0.02) in treated wastewater compared with the raw wastewater.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8