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Occurrence of antibiotic resistance in Escherichia coli from surface waters and fecal pollution sources near Hamilton, Ontario

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Antibiotic resistance was examined in 462 Escherichia coli isolates from surface waters and fecal pollution sources around Hamilton, Ontario. Escherichia coli were resistant to the highest concentrations of each of the 14 antibiotics studied, although the prevalence of high resistance was mostly low. Two of 12 E. coli isolates from sewage in a CSO tank had multiple resistance to ampicillin, ciprofloxacin, gentamicin, and tetracycline above their clinical breakpoints. Antibiotic resistance was less prevalent in E. coli from bird feces than from municipal wastewater sources. A discriminant function calculated from antibiotic resistance data provided an average rate of correct classification of 68% for discriminating E. coli from bird and wastewater fecal pollution sources. The preliminary microbial source tracking results suggest that, at times, bird feces might be a more prominent contributor of E. coli to Bayfront Park beach waters than municipal wastewater sources.Key words: antibiotic resistance, Escherichia coli, surface water, fecal pollution.

La résistance aux antibiotiques a été examinée chez 462 isolats de Escherichia coli issus d'eaux de surface et de sources de pollution fécale aux environs d'Hamilton, Ontario. Des E. coli furent résistants aux plus hautes concentrations de chacun des 14 antibiotiques étudiés, bien que la prévalence de la résistance élevée était plutôt basse. Deux des 12 isolats de E. coli provenant d'eau d'égouts d'un déversoir d'eau excédentaire avaient une résistance multiple à l'ampicilline, la ciprofloxacine, la gentamycine et la tétracycline au delà de leur seuil clinique. La résistance aux antibiotiques était moins prévalente chez les E. coli de fèces d'oiseaux que de sources d'eaux usées municipales. Une fonction de discrimination calculée à partir des données de résistance aux antibiotiques a fourni un taux de classification exacte de 68 % pour discriminer E. coli de sources de pollution fécale d'oiseaux versus d'eaux usées. Les résultats préliminaires de dépistage des sources microbiennes indiquent que les fèces d'oiseaux pourraient parfois contribuer davantage au E. coli des eaux de la plage de Bayfront Park que les sources d'eaux usées municipales.Mots clés : résistance aux antibiotiques, Escherichia coli, eaux de surface, pollution fécale.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2005-06-01

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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