Antigen-negative meningitis due to group A Neisseria meningitidis.
D000907:Antibodies, Bacterial / Q000032:analysis; D000942:Antigens, Bacterial / Q000032:analysis*; D002555:Cerebrospinal Fluid / Q000382:microbiology*; D006385:Hemagglutination Inhibition Tests; D006386:Hemagglutination Tests; D006801:Humans; D006967:Hypersensitivity / Q000209:etiology; D007122:Immunoelectrophoresis; D008585:Meningitis, Meningococcal / Q000134:cerebrospinal fluid / Q000150:complications / Q000175:diagnosis* / Q000453:epidemiology / Q000401:mortality; D009345:Neisseria meningitidis / Q000276:immunology*; D009549:Nigeria
D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial