Immunogenicity and safety study of 1 and 2 doses of GSK Biologicals’ meningococcal vaccine GSK134612 in toddlers, persistence up to 5 years after vaccination and co-administration with Pfizer’s pneumococcal vaccine Prevenar 13™. https://clinicaltrials.gov/ct2/show/NCT01939158?term=C0921003&rank=1 Register Today!