equine horse 2 risk factors 2 Acer spp 1 AmpC 1 AmpC β-lactamase 1 CTX-M-1 1 Chilean corralero horse 1 ESBL 1 ESBL-E 1 ESBL-E acquisition 1 Enterobacteriaceae 1 Escherichia coli 1 Humanities 1 Klebsiella pneumoniae 1 MSSA 1 NEFA 1 North America 1 SHV 1 ST1640 1 Social interaction 1 Standardbred trotters 1 alfalfa 1 antibiotic resistance 1 antibiotic-resistance 1 antimicrobial resistance 1 behaviour 1 beta-lactamase 1 biodiversity 1 cephalosporinase 1