Comparative trial to assess the reactogenicity of the diphtheria-tetanusacellular pertussis (DTPa) vaccine plus Haemophilus influenzae type b(Hib) conjugate vaccine and that of the diphtheria-tetanus-whole cell pertussis (DTPw) vaccine plus Hib conjugate vaccine, administered in single injection as a booster dose to 14-20 months-old children

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