The antimicrobial resistance developed by these pathogens
is one of the main reasons for low cure rates in mastitis [3,17].
Streptomycin is a broad-spectrum antibiotic that is widely
used on dairy farms, and information about the presence of
antimicrobial resistance genes in E. coli associated with
mastitis is limited [28,30,31].
The aim of the present study was to better understand the
etiology of E. coli isolates associated with mastitis. All E. coli
isolates were characterized and compared in terms of their
phylogenetic group, virulence factors and antimicrobial
resistance.