title: Antibiotic resistance of Escherichia coli in leachates from municipal solid waste landfills: comparison between semi-aerobic and anaerobic operations.
abstract: A bacterial susceptibility test to 31 antibiotics was conducted on the 80 isolated Escherichia coli from the leachates of the landfills in two different operations: semi-aerobic (SL) and anaerobic (AL) landfills. The average population of E. coli from SL and AL leachates were 2.2 × 10(4) and 9.4 × 10(3)CFU/100ml, respectively. Between 80.8% and 87.5% of the E. coli isolated from both leachates as resistant to the tested antibiotics and high resistances were found to doxycycline (53.8-68.8%), cephalothin (57.5-61.3%), tetracycline (51.3-67.5%) and minocycline (37.5-46.3%). The percentages of isolates resistant to most antibiotics were higher in the AL leachate. The exception was nitrofurantoin to which the isolates from the SL were highly resistant. E. coli from both sources showed similarly high susceptibilities (90-100%) to aminoglycosides, quinolones, chloramphenicol, sulfonamide and some new beta-lactams. The difference in available oxygen in landfills could affect E. coli susceptibility to antibiotics in leachates.
authors.affiliation: Department of Environmental Engineering/Center of Advanced Studies in Industrial Technology, Faculty of Engineering, Kasetsart University, Chatuchak, Bangkok, Thailand.
authors.forename: Simanata
authors.initials: S
authors.lastname: Threedeach
authors.forename: Wilai
authors.initials: W
authors.lastname: Chiemchaisri
authors.forename: Toru
authors.initials: T
authors.lastname: Watanabe
authors.forename: Chart
authors.initials: C
authors.lastname: Chiemchaisri
authors.forename: Ryo
authors.initials: R
authors.lastname: Honda
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yamamoto
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects*; D008826:Microbial Sensitivity Tests; D012037:Refuse Disposal