title: 'The enigma of the meningococcus'.
mesh_terms: D000328:Adult; D002648:Child; D049673:History, 20th Century; D006801:Humans; D007075:Immunoglobulin M; D008589:Meningococcal Infections / Q000209:etiology / Q000266:history* / Q000276:immunology; D008887:Military Medicine / Q000266:history*
chemical_list: D007075:Immunoglobulin M