The invention provides compositions comprising a combination of two or more monovalent conjugates, each of said two or more monovalent conjugates comprising a carrier protein comprising T cell epitopes from two or more pathogens conjugated to saccharide antigen. The invention also provides a multivalent conjugate comprising two or more antigenically distinct saccharide antigens conjugated to the same carrier protein molecule, wherein the carrier protein comprises T cell epitopes from two or more pathogens. Further compositions comprise one or more of said monovalent conjugates and one or more of said multivalent conjugates. The invention further provides methods for making said compositions and uses for said compositions.