Lack of adjuvant effect of the pertussis component on IPV DTP-polio vaccine in children.

: On day 0, four groups of children (3 to 6 months old) randomly received IPV alone or IPV + pertussis, or IPV + DP, or IPV + DTP. At days 28 and 56, all the children received the same IPV + DTP vaccine. Polio neutralizing and diphtheria antibodies were determined at days 0, 28 and 56. No adjuvant and even some inhibitory effect of pertussis was observed at days 28 and 56 on mean polio antibody titers. These results are compared to those observed with diphtheria.