• Deficiency of the seventh component of complement : a case report 

      Cooper, R. C.; Hendricks, M. L.; Daniels, J.; Coetzee, S.; Potter, P. C. (Health & Medical Publishing Group, 1991)
      Deficiency of the 7th component of the complement cascade was diagnosed in a white male with recurrent meningococcal infections. This deficiency has not previously been reported in South Africa.