Meningococcal disease.
D000293:Adolescent; D001770:Blood Bactericidal Activity; D004562:Electrocardiography; D006402:Hematologic Diseases / Q000150:complications; D006801:Humans; D008297:Male; D008585:Meningitis, Meningococcal / Q000150:complications; D008589:Meningococcal Infections / Q000097:blood / Q000276:immunology; D009205:Myocarditis / Q000150:complications