title: [SMON and Echo type 21 virus].
mesh_terms: D000005:Abdomen; D000818:Animals; D001062:Appendectomy; D004457:Echovirus Infections; D005260:Female; D000882:Haplorhini; D006801:Humans; D007564:Japan; D008297:Male; D009187:Myelitis / Q000209:etiology* / Q000276:immunology; D009902:Optic Neuritis / Q000209:etiology* / Q000276:immunology; D011183:Postoperative Complications; D012737:Sex Factors