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Flavophospholipol: effect on multi-drug resistant Salmonella enterica serovar Typhimurium in swine.

Materials and methods: Fifty-six pigs (60 days old) that tested negative by culture for Salmonella were allocated into four treatment groups and challenged with either Salmonella serovar Typhimurium DT104 or Salmonella Typhimurium DT193. After challenge, each treatment group was fed one of four feed rations: a ration containing no antimicrobials (Control) or the same ration containing either flavophospholipol (F), penicillin and chlortetracycline (PCt), or penicillin, chlortetracycline, and flavophospholipol (PCtF). Fecal samples were obtained weekly for 20 weeks (three samples pre-challenge and 17 post challenge) and processed for Salmonella isolation and antimicrobial-resistance testing.