A randomized, controlled comparison was made in 175 healthy 18-month-old children given either diphtheria and tetanus toxoids and pertussis vaccine, adsorbed (DTP) and haemophilus b diphtheria toxoid conjugate vaccine (PRP/D) concurrently at separate sites (66 children) or a new vaccine combining these products (109 children). Rates of local or systemic adverse effects postimmunization and antibody responses to each component did not differ significantly between groups. DTP-containing vaccines were better tolerated when given in the thigh than in the arm. The combination DTP-PRP/D vaccine performed satisfactorily at 18 months of age, avoiding the inconvenience of two injections.
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