title: Letter: Group-Z meningococci.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis; D007106:Immune Sera; D009345:Neisseria meningitidis / Q000145:classification / Q000276:immunology*; D011817:Rabbits / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D007106:Immune Sera