The present study described the evolution of antimicrobial resistance in equine pathogens isolated from 2016 to 2019. A collection of 7806 bacterial isolates were analysed for their in vitro antimicrobial susceptibility using the disk diffusion method. The most frequently isolated pathogens were group C Streptococci
(27.0%), Escherichia coli
(18.0%), Staphylococcus aureus
(6.2%), Pseudomonas aeruginosa
(3.4%), Klebsiella pneumoniae
(2.3%) and Enterobacter
spp. (2.1%). The majority of these pathogens were isolated from the genital tract (45.1%, n = 3522). With the implementation of two French national plans (named ECOANTIBIO 1 and 2) in 2012–2016 and 2017–2021, respectively, and a reduction in animal exposure to veterinary antibiotics, our study showed decreases in the resistance of group C Streptococci
, Klebsiella pneumoniae
and Escherichia coli
against five classes, four classes and one class of antimicrobials tested, respectively. However, Staphylococcus aureus
, Escherichia coli
spp. presented an increased resistance against all the tested classes, excepted for two fifths of E. coli.
Moreover, the percentages of multi-drug resistant strains of Staphylococcus aureus
spp. also increased from 24.5% to 37.4% and from 26.3% to 51.7%, respectively. The data reported here are relevant to equine practitioners and will help to improve knowledge related to antimicrobial resistance in common equine pathogens.
This is an open access article distributed under the Creative Commons Attribution License
which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited