The invention features methods for treating Clostridium difficile infection (CDI), C. difficile associated disease, and symptoms thereof, featuring the use of antibodies having enhanced half-life that specifically bind C. difficile toxin A and/or toxin B. In one aspect, the invention provides a method of treating a C. difficile infection or C. difficile-associated disease in a subject, the method involving administering to the subject a combination of an anti-C. difficile toxin A antibody and an anti-C. difficile toxin B antibody having an alteration that increases the half-life of one or both antibodies relative to anti-C. difficile toxin A and B antibodies lacking the alteration. In one aspect, the invention features a composition comprising an equimolar mixture of an anti-toxin A antibody and an antitoxin B antibody. The invention provides kits for treating a C. difficile infection or symptoms thereof.
