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Advisor(s)
Abstract(s)
The main objective oflhis work was to study the ecology of enterooocci 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 ofbacteria. The
predominant species found in the raw wastewater-were Erztercaccus hirae, Entercoc-
cus faecium and Enrercnrcus faecalis. Wastewater treatment led to a reduction in
E. hirae (ar < 0.1) and an increase Ln B fnecium [nt < [}_1); the relative proportions
ofE. fczecalis remained the same in the raw and in the treated wastewater. Among the
isolates tested, no vanoornyclln resistance was observed among the cnterococci.
Entercoccus faecium and E. fneculis showed resistance prevalence values reaching
33%. 40% and 57% for the antibiotics ciprofloxacin, erythromycin and tetracycline,
respectively. Antibiotieresistant 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 (ac < 0.52) in treated
wastewater compared with the raw wastewater.
Description
Keywords
Enterococci Ecology Entibiotic Resistante Wastewater treatment
Pedagogical Context
Citation
"FEMS Microbial Ecology." ISSN 0168-6496. 55 (2006) 322-329
Publisher
Blackwell