Many of these vaccines combine a common «carrier» protein called tetanus toxoid with an innocuous carbohydrate capsule derived from a pathogen. (sciencemag.org)
The most likely theory, they say, is that multiple tetanus toxoid vaccines may produce antibodies that respond to the combination of the capsular pathogen and its carrier. (sciencemag.org)
Dagan suggests that the difference between the two groups may be caused by the fact that Israeli DTP vaccine contains twice the tetanus toxoid as those given to Finnish infants. (sciencemag.org)