Virulence factors, antimicrobial resistance and phylogeny of bovine mastitis-associated.

Abstract

We carried out a thorough genetic evaluation ofisolated from clinical bovine mastitis cases and performed a phylogenetic analysis to represent the evolutionary relationship betweensequences. A total of 35strains were isolated from cases of clinical mastitis identified at a large commercial dairy farm located near Ithaca, New York. Whole-genome sequencing identified twenty-six antibiotic resistance genes, four of which were acquired genes, in addition to fifty virulence genes. Multi-locus sequence typing detected three new sequence types (STs). We conclude that a high proportion of this microorganism carries multiple virulence determinants and resistance genes, and that this indicates its potential to cause mastitis. Eight different STs were identified, of which ST453 (= 17) was the most prevalent and ST714, ST715, ST716 were novel STs.