title: A new serological group (E) of Neisseria meningitidis.
abstract: A new serological group of encapsulated Neisseria meningitidis, tentatively classified as group E, produced halo precipitates with homologous antiserum. Group-specific complement-fixing antibodies were produced in rabbits by inoculation with lysed cells. The group E isolates are immunologically related to group C, as shown by precipitation and quantitative agglutination. Antisera to group E strains did not protect mice challenged with groups A, B, or C organisms. Until now, a comparison of group E strains with the X, Y, and Z strains of Slaterus has not been conducted.
mesh_terms: D000372:Agglutination Tests; D000818:Animals; D003168:Complement Fixation Tests; D007114:Immunization; D051379:Mice; D009345:Neisseria meningitidis / Q000145:classification* / Q000276:immunology* / Q000302:isolation & purification / Q000472:pathogenicity; D011233:Precipitin Tests; D011817:Rabbits; D014774:Virulence