Equines are closely related to humans, being used in many different activities. With this, it is
essential to know the affections that affect this species and, especially, those with zoonotic
potential. The bacteria of the family Enterobacteriacea are gram-negative, having as main
agents Salmonella spp. and Escherichia coli, which are pathogens common to several animals
and to humans, and are therefore of relevance in public and animal health throughout the
world. Therefore, this study is extremely important for understanding the epidemiology of
these agents in equine and human health as well as in the recognition of bacterial resistance
and antimicrobial susceptibility. In view of the scarcity of studies published in Brazil
regarding the situation of E. coli and Salmonella spp. in the equine species, this work aimed
to verify the prevalence of these agents in horses of Araguaína city as well as verify their
susceptibility to different antimicrobials. Feces were collected from the rectal ampulla of 72
healthy horses and bacterial isolation was performed, starting with selective broth enrichment,
followed by plating in semi-solid medium, biochemical tests and serum agglutination. After
confirmation, the antimicrobial susceptibility test was carried out against the main antibiotics
used in human and veterinary therapy. The prevalence found in this study for diarrheogenic
E.coli and Salmonella spp. was 47.06% and 4.17%, respectively. As for antimicrobial
susceptibility, ciprofloxacin was the most efficient for both agents, followed by meropenem
(E.coli) and sulfa / trimetropim (Salmonella spp.). It is concluded that the horses evaluated
can be asymptomatic carriers of Salmonella spp. and harbor pathogenic strains of E. coli, and
that the identification of the agent as well as the performance of the antibiogram is
fundamental for the institution of prophylactic measures and appropriate therapy,
respectively
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