Cephalosporin-associated colitis and Clostridium difficile.

A case of cephalosporin-associated colitis occurred in which a tissue-cultured morphologic-altering activity was demonstrated in the patient's feces during the active episode. Neutralization of the tissue culture activity by antiserum directed against a partially purified toxin of Clostridium difficile provided a more suggestive link between the colitis and this clostridial species.