The present invention is in the field of pneumococcal capsular saccharide conjugate vaccines. Specifically, a multivalent Streptococcus pneumoniae immunogenic composition is provided comprising 10 or more capsular saccharides from different S. pneumoniae serotypes which are conjugated to a carrier protein, and comprising 3 or more different carrier proteins, wherein the composition comprises: serotype 19F capsular saccharide conjugated to diphtheria toxoid (DT); serotype 18C capsular saccharide conjugated to tetanus toxoid (TT); serotype 1,4,5,6B,7F,9V,14 and 23F capsular saccharides conjugated to protein D from Haemophilus influenzae .本發明揭示一種免疫原組合物,其包含得自血清型19A及19F之肺炎鏈球菌莢膜醣結合物,其中19A與第一細菌類毒素結合且19F與第二細菌類毒素結合。本發明亦描述疫苗、疫苗之製備方法及該等疫苗之用途。