The use of Haemophilus influenzae type b-tetanus toxoid conjugate vaccine mixed with diphtheria-tetanus-pertussis vaccine in Gambian infants.

Abstract

In preparation for an efficacy trial of PRP-T Haemophilus influenzae type b conjugate vaccine, 251 Gambian infants were randomized to receive three doses of PRP-T and diphtheria-tetanus-pertussis (DTP) vaccines at 2, 3 and 4 months of age, either by separate injections, or combined in the same syringe. One month after the third dose, there was no difference between anti-PRP levels in those infants who received the vaccines separately (GMT 5.83 micrograms ml-1), and those who received the vaccines combined (GMT 5.57 micrograms ml-1). The proportions achieving levels of 1.0 microgram ml-1 were 89% and 92% in the "separate" and "combined" vaccine groups, respectively. There were no significant ..