Abstract :
[en] The purpose of this work was to evaluate the level of antimicrobial resistant
Escherichia coli isolates in freshwaters and hospital effluents in Belgium. The
samples were collected from 24 locations along the Ourthe, Vesdre, Ambl eve
and Meuse rivers and in the wastewater effluents of several hospitals. The
sampling stations in rivers were classified according to the dominant land
covers of the rivers (rural, urban and forest areas). Two sampling campaigns
were organized in May and October 2019 to highlight a possible seasonal
effect. A total of 938 E. coli strains were isolated on Chromogenic Selective
Tryptone Bile X-glucuronide (TBX) and TBX supplemented with amoxicillin
(TBX+AMX) media. Disk diffusion assays were performed following the
EUCAST’s recommendations to assess the antimicrobial resistance against 12
antibiotics. A total of 32 7% of strains were at least resistant to one antibiotic
and 24 6% were multiple antimicrobial resistant strains on TBX. The highest
resistance rates were found for ampicillin (AMP), amoxicillin coupled with
clavulanic acid (AMC) and sulfamethoxazole/trimethoprim (SXT). The lowest
resistance rates were observed for meropenem (MEM) and ertapenem (ETP),
which are last resort antibiotics. No significant difference was observed
between both campaigns for the resistance rate to antibiotics.
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