Immunogenic composition

1. A method of immunising a human host against disease caused by Haemophilus influenza (Hib) comprising administering to the human host an immunoprotective dose of an immunogenic composition, wherein the immunogenic composition comprises: a Hib saccharide conjugate; a Neisseria meningitidis ( N. meningitidis ) capsular saccharide conjugate derived from a strain selected from the group consisting of serogroup A, serogroup B, serogroup C, serogroup W135 and serogroup Y; and an antigen selected from the group consisting of whole cell pertussis and hepatitis B surface antigen, wherein the saccharide dose of the Hib saccharide conjugate is less than 5 μg and the saccharide dose of the N. meningitidis capsular saccharide conjugate is less than 8 μg, and wherein the Geometric Mean Concentration (GMC) for the antigen achieved with said immunogenic composition is higher than the GMC achieved after immunisation with said immunogenic composition containing a 5 μg saccharide dose of Hib saccharide conjugate and an 8 μg dose of N. meningitidis capsular saccharide conjugate.

2. The method of claim 1 wherein the saccharide dose of the N. meningitidis capsular saccharide conjugate is less than 6 μg.

3. The method of claim 1 wherein the saccharide dose of the N. Meningitidis capsular saccharide conjugate is 1-4 μg.

4. The method of claim 1 wherein the immunogenic composition comprises N. meningitidis serogroup C capsular saccharide (MenC).

5. The method of claim 1 wherein the immunogenic composition comprises N. meningitidis serogroup A capsular saccharide (MenA).

6. The method of claim 1 wherein the immunogenic composition comprises N. meningitidis serogroup Y capsular saccharide (MenY).

7. The method of claim 1 wherein the immunogenic composition comprises N. meningitidis serogroup W135 capsular saccharide (MenW).

8. The method of claim 1 wherein the immunogenic composition comprises diphtheriae toxoid (DT), tetanus toxoid (TT), whole cell pertussis antigen (Pw) and Hepatitis B surface antigen (HepB).

9. The method of claim 1 wherein the immunogenic composition comprises a N. meningitidis serogroup B outer membrane vesicle preparation.

10. The method of claim 1 wherein the immunogenic composition comprises a Streptococcus pneumoniae capsular saccharide derived from a strain selected from the group consisting of serotypes 1, 2, 3, 4, 5, 6A, 6B, 7F, 8, 9N, 9V, 10A, 11A, 12F, 14, 15B, 17F, 18C, 19A, 19F, 20, 22F, 23F and 33F.

11. The method of claim 1 wherein the at least one additional bacterial saccharide conjugate comprises a Salmonella typhi Vi capsular saccharide.

12. The method of claim 1 wherein said N. meningitidis capsular saccharide conjugate is conjugated to the same carrier protein as used in the Hib conjugate.

13. The method of claim 1 wherein the Hib saccharide is conjugated to a carrier protein selected from the group consisting of tetanus toxoid (TT), diphtheria toxoid (DT), cross-reacting material 197 (CRM197), fragment C of tetanus toxoid, protein D, meningococcal outer membrane protein (OMPC) and pneumolysin.

14. The method of claim 1 wherein said N. meningitidis saccharide is conjugated to a carrier protein selected from the group consisting of tetanus toxoid (TT), diphtheria toxoid (DT), cross-reacting material 197 (CRM197), fragment C of tetanus toxoid, protein D, meningococcal outer membrane protein (OMPC) and pneumolysin.

15. The method of claim 1 wherein the ratio of Hib to carrier protein in the Hib saccharide conjugate is between 1:5 and 5:1 weight/weight (w/w).

16. The method of claim 1 wherein the Hib saccharide conjugate and the N. meningitidis saccharide conjugate is not adsorbed onto aluminium salts.

17. The method of claim 1 for immunising a human host against meningitis.

18. The method of claim 2 for immunising a human host against disease caused by Neisseria meningitides.