title: Meningitis caused by a nonencapsulated strain of Neisseria meningitidis in twin infants with a C6 deficiency.
mesh_terms: D003183:Complement C6 / Q000172:deficiency*; D004200:Diseases in Twins; D006801:Humans; D007223:Infant; D008297:Male; D008585:Meningitis, Meningococcal / Q000382:microbiology*; D009345:Neisseria meningitidis / Q000032:analysis / Q000472:pathogenicity*; D014774:Virulence
chemical_list: D003183:Complement C6