title: [Several practicalproblems raised controlled field trials of an antimeningococcical vaccine].
mesh_terms: D000349:Africa; D001428:Bacterial Vaccines; D004812:Epidemiologic Methods; D006801:Humans; D008585:Meningitis, Meningococcal / Q000517:prevention & control*; D014611:Vaccination
chemical_list: D001428:Bacterial Vaccines
vernacular_title: De quelques problèmes patiques posés par les essais controlés sur le terrain d'un vaccin antiméningococcique.