Effect of land application of manure from enrofloxacin-treated chickens on ciprofloxacin resistance of Enterobacteriaceae in soil

• Published in: The Science of the total environment 2014-06, Vol.482-483, p.269-275
• Main Authors: Pourcher, A.-M., Jadas-Hécart, A., Cotinet, P., Dabert, P., Ziebal, C., Le Roux, S., Moraru, R., Heddadj, D., Kempf, I.
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Animal Husbandry; Animals; Anti-Bacterial Agents - pharmacology; Anti-Bacterial Agents - therapeutic use; Applied sciences; Biochemistry and biology; Biological and medical sciences; Biological and physicochemical properties of pollutants. Interaction in the soil; Chemical, physicochemical, biochemical and biological properties; Chicken manure; Ciprofloxacin; Ciprofloxacin - pharmacology; Drug Resistance, Bacterial - genetics; Enrofloxacin; Enterobacteriaceae; Enterobacteriaceae - classification; Enterobacteriaceae - genetics; Enterobacteriaceae - growth & development; Environmental Sciences; ERIC-PCR; Exact sciences and technology; Fluoroquinolones - therapeutic use; Fundamental and applied biological sciences. Psychology; Generalities; Manure - microbiology; Microbial Sensitivity Tests; Physics, chemistry, biochemistry and biology of agricultural and forest soils; Pollution; Refuse Disposal; Soil; Soil - chemistry; Soil and sediments pollution; Soil Microbiology; Soil science
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2014.02.136

A field plot experiment was carried out to evaluate the impact of spreading chicken manure containing enrofloxacin (ENR) and its metabolite ciprofloxacin (CIP), on the levels of CIP-resistant Enterobacteriaceae in soil. The manures from chickens treated with ENR and from untreated control chickens were applied on six plots. Total and CIP-resistant Enterobacteriaceae were counted on Violet Red Bile Glucose medium containing 0 to 16mgL−1 of CIP. A total of 145 isolates were genotyped by enterobacterial repetitive intergenic consensus-polymerase chain reaction (ERIC-PCR). The minimum inhibitory concentration (MIC) of CIP for the isolates of each ERIC-PCR profile was determined. The most frequently isolated Enterobacteriaceae included Escherichia coli, and to a lesser extent, Enterobacter and 5 other genera from environmental origin. The composition of the E. coli community differed between manure and manured soil suggesting that the E. coli genotypes determined by ERIC-PCR varied significantly in their ability to survive in soil. One of these genotypes, including both susceptible and resistant isolates, was detected up to 89days after the manure was applied. Most of the E. coli isolated in soil amended with manure from treated chickens was resistant to CIP (with a MIC ranging between 2 and 32mgL−1). In contrast, despite the presence of ENR in soil at concentrations ranging from 13–518μgkg−1, the environmental Enterobacteriaceae isolates had a CIP MIC≤0.064mgL−1, except one isolate which had a MIC of 0.25mgL−1, These results showed that spreading manure from ENR-treated chickens enabled CIP-resistant E. coli to persist for at least three months in the soil. However, neither the presence of fluoroquinolones, nor the persistence of CIP-resistant E. coli, increased the CIP-susceptibility of environmental Enterobacteriaceae. •ENR persisted at least seven weeks in soil amended with chicken manure.•Composition of the E. coli community differed between manure and amended soil.•CIP-resistant E. coli persisted at least three months in the manured soil.•Presence of ENR in soil did not increase the MIC of environmental Enterobacteriaceae.