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        Equine hyperimmune serum protects mice against Clostridium difficile spore challenge

        Weiwei Yan,Kang-Soon Shin,Shih-Jon Wang,Hua Xiang,Thomas Divers,Sean McDonough,James Bowman,Anne Rowlands,Bruce Akey,Hussni Mohamed,Yung-Fu Chang 대한수의학회 2014 Journal of Veterinary Science Vol.15 No.2

        Clostridium (C.) difficile is a common cause of nosocomialdiarrhea in horses. Vancomycin and metronidazole havebeen used as standard treatments but are only moderatelyeffective, which highlights the need for a novel alternativetherapy. In the current study, we prepared antiserum ofequine origin against both C. difficile toxins A and B as wellas whole-cell bacteria. The toxin-neutralizing activities of theantibodies were evaluated in vitro and the prophylacticeffects of in vivo passive immunotherapy were demonstratedusing a conventional mouse model. The data demonstratedthat immunized horses generated antibodies against bothtoxins A and B that possessed toxin-neutralizing activity. Additionally, mice treated with the antiserum lost less weightwithout any sign of illness and regained weight back to anormal range more rapidly compared to the control groupwhen challenged orally with 107 C. difficile spores 1 day afterserum injection. These results indicate that intravenousdelivery of hyperimmune serum can protect animals from C. difficile challenge in a dose-dependent manner. Hence,immunotherapy may be a promising prophylactic strategyfor preventing C. difficile infection in horses.

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