We would like to develop AAD mice model in order to determine the effect of antibody therapeutics against AAD in mice. In this process, we selected C57BL/6 mice and treated with antibiotic cocktail followed by challenging with live Clostridium difficile (as per the method described by Chen et al., (2008). We have not observed any symptoms for diarrhea in the animals. Please help us to develop such models successfully. Thank you.