In a clinical trial that compared separate with concomitant administrations of Prevenar (three doses at 2, 3.5, 6 months and a booster dose at approximately 12 months) and Meningitec (meningococcal C conjugate vaccine; two doses at 2 and 6 months and a booster dose at approximately 12 months) there was no evidence of immune interference between the two conjugate vaccines after the primary series or after the booster doses.