Antibiotic residues in livestock manure: Does the EU risk assessment sufficiently protect against microbial toxicity and selection of resistant bacteria in the environment?

Publikation: Beiträge in ZeitschriftenZeitschriftenaufsätzeForschungbegutachtet

Authors

Antibiotic residues that reach the environment via land application of livestock manure could impact structure and function of microbial communities and promote the spread of antibiotic resistant bacteria (ARB) and antibiotic resistance genes (ARGs). To assess whether there is a risk, we have reviewed extensive data on five veterinary antibiotics (VAs) that are commonly used in livestock farming (amoxicillin, enrofloxacin, sulfadiazine, tetracycline, trimethoprim). Predicted environmental concentrations (PECs) after the medication of pigs were derived using (i) a total residue approach and (ii) the VetCalc model to account for additional fate parameters and regional scenarios specific to Germany. Predicted no effect concentrations (PNECs) for microbial toxicity and ARB selection were derived from available concentration-response data. Except for enrofloxacin, the total residue PECs exceeded 100 μg kg-1 in soil and risk quotients indicated a high risk for soil porewater and surface water (PEC/PNEC > 1). After PEC refinement, the risk in surface water was generally low. However, in soil porewater still a high risk was indicated for sulfadiazine, tetracycline, and trimethoprim that could persist up to 100 days after the manure application. These findings suggest an urgent need for regulatory action to mitigate the risk resulting from the presence of antibiotic residues in soil.

OriginalspracheEnglisch
Aufsatznummer120807
ZeitschriftJournal of Hazardous Materials
Jahrgang379
ISSN0304-3894
DOIs
PublikationsstatusErschienen - 05.11.2019

DOI

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