title: The efficacy of meningococcal polysaccharide vaccine in preventing group A meningococcal disease in The Gambia, West Africa.
mesh_terms: D001428:Bacterial Vaccines; D005714:Gambia; D006801:Humans; D007223:Infant; D008585:Meningitis, Meningococcal / Q000517:prevention & control*; D022401:Meningococcal Vaccines; D014611:Vaccination
chemical_list: D001428:Bacterial Vaccines; D022401:Meningococcal Vaccines