The 3rd part of the paper deals with the results of a combined revaccination against diphtheria and tetanus in a group of 25 children after allogeneic bone marrow transplantation (BMT) with and without graft versus host disease (GvHD) and after autologous transplantation. It can be shown that in the allogeneic transplanted groups with and without GvHD it is possible to build up a tetanus and diphtheria antitoxin titre in a safe protective cause by a 2nd basic immunisation consisting of 3 single vaccinations starting about 9 to 12 months later. For autologous transplanted children only 1 to 2 vaccinations at a later term than for the allogeneic transplanted children may possibly be sufficient.
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