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Oral administration of Enterococcus lactis strain SF68 speeds the recovery of amoxicillin-clavulanate-induced dysbiosis in cats

Slaughter M, Sung CH, Suchodolski J, Pilla R, Torres-Hendersen C, Lappin MR

Journal of feline medicine and surgery, 2026

Abstract

ObjectivesIn a previous study by Torres-Henderson et al, the probiotic Enterococcus lactis strain SF68 was clinically shown to lessen amoxicillin-clavulanate-associated diarrhea. The cause or mechanism as to why this clinical benefit occurred, however, was not apparent in that study. Since the completion of that work, a new feline dysbiosis index (DI) has been developed and new information concerning the microbiome and bile acid metabolism has been published. The objective of this study was to assess changes in the feline DI and fecal bile acid metabolism to explain how this probiotic lessened amoxicillin-clavulanate-associated diarrhea.MethodsA prospective, randomized, placebo-controlled, double-blinded study was conducted with 27 healthy, young, adult, purpose-bred cats that were used for a previous study. The cats were randomized into the probiotic group (13 cats) or placebo group (14 cats). Each cat received amoxicillin-clavulanate for 7 days at a standard dose and either the probiotic or placebo for 14 days. Fecal samples from all cats were obtained at baseline, day 7 and day 14. All samples were frozen at -80°C until assessed. Targeted quantitative PCR assays were then used to determine the fecal feline DI, and unconjugated fecal bile acid concentrations were measured at each time point.ResultsAn antibiotic-induced shift in fecal microbiota and unconjugated bile acids was observed, with the probiotic group showing normalization of the feline DI and increased secondary…

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Evidence Hub reads this as a randomized trial, done in people. Its evidence level is 2 of 5 (High · randomized trial). Randomized trials of a reasonable size are the strongest single-study design.

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