Abstract
This study determined the antagonistic activity of a probiotic Bacillus subtilis strain PB6 (PB6) toward six bacterial pathogens of equine origin. Antimicrobial activity of PB6 was evaluated using two different in vitro methodologies. A streak line assay resulted in measurable zones of clearing between growth of PB6 and Clostridium difficile, Clostridium perfringens, Rhodococcus equi, and Streptococcus equi. A broth micro dilution assay using cell-free supernatant from PB6 culture demonstrated inhibition of Salmonella Typhimurium and R. equi growth. The results indicate the potential for PB6 to be a beneficial probiotic for use in the equine industry.
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