<;P>;PROBLEM TO BE SOLVED: To provide an active mucosal adjuvant which can be used for increasing the immunogenicity of antigens when it is administered orally or at intranasal mucosal surfaces. <;P>;SOLUTION: There is provided a pharmaceutical composition comprising a nontoxic mucosal adjuvant mixed with a second antigen. In one embodiment, the composition comprises the nontoxic mucosal adjuvant which is a detoxified mutant of a bacterial ADP-ribosylated toxin and in another embodiment, comprises a mutant which is the detoxified mutant of CT or LT. <;P>;COPYRIGHT: (C)2010,JPO&INPIT