| immunogenicity of fractional doses of tetravalent a/c/y/w135 meningococcal polysaccharide vaccine: results from a randomized non-inferiority controlled trial in uganda. | neisseria meningitidis serogroup a is the main causative pathogen of meningitis epidemics in sub-saharan africa. in recent years, serogroup w135 has also been the cause of epidemics. mass vaccination campaigns with polysaccharide vaccines are key elements in controlling these epidemics. facing global vaccine shortage, we explored the use of fractional doses of a licensed a/c/y/w135 polysaccharide meningococcal vaccine. | 2008 | 19048025 |