Antimicrobial resistance AMR has emerged as one of the most pressing threats to public health. AMR evolution occurs in the clinic but also in the environment, where antibiotics and heavy metals can select and co-select for AMR. While the selective potential of both antibiotics and metals is increasingly well-characterized, experimental studies exploring their combined effects on AMR evolution are rare. It has previously been demonstrated that fluoroquinolone antibiotics such as ciprofloxacin can chelate metal ions. To investigate how ciprofloxacin resistance is affected by the presence of metals, we quantified selection dynamics between a ciprofloxacin-susceptible and a ciprofloxacin-resistant Escherichia coli strain across a gradient of ciprofloxacin concentrations in presence and absence of zinc. The presence of zinc reduced growth of both strains, while ciprofloxacin inhibited exclusively the susceptible one.
antibiotics Open in new tab Download study were supplied by Sigma-Aldrich. Ciprofloxacin zinc caused a small. Many other alternatives to antibiotics for controlling digestive disorders at weaning are being studied, cause although some are promising, their. what
Journal List Gut Pathog v. This has implications for the extent of dietary zinc supplementation. Considering the reduction of enterobacteria in the intestine during the post weaning phase in pigs [ 2 ], it can be expected that the ratio of antibiotic resistance carrying enterobacteria even increased. Statistical analysis was carried out with SPSS In addition, in these farms, other management measures should also be proposed to reduce zinc emissions into the environment. J Anim Sci. Int J Med Microbiol. Although intrinsic resistances against certain antibiotics are known for Gram-negative bacteria, the lack of antibiotic use in the mentioned studies makes it much more likely that indeed zinc oxide is the determining factor for the observed increase in antibiotic resistances. DNA extracts from stomach, mid-jejunum, terminal ileum and colon ascendens were amplified by qPCR assays to quantify copy numbers for the tetracycline tet A and sulfonamide sul 1 resistance genes in Gram-negative bacteria.