1 From the University Children's Hospital Het Wilhelmina Kinderziekenhuis, Utrecht; University Hospital, Leiden; and University Hospital, Utrecht, The Netherlands
A family is described in which 3/11 children showed a homozygous deficiency of C3, and both parents and six other children had subnormal levels of C3. The three children with selective C3 deficiency suffered repeatedly from bacterial infections, whereas the parents and the other siblings were clinically healthy. During infectious episodes the patients showed a maculopapular skin rash, and at such times immune complexes were present in the serum. Biopsy specimens of the skin lesions showed the picture of leukocytoclastic vasculitis.
Key Words: complement deficiency third component of complement vasculitis recurrent infections circulating immune complexes
Submitted on January 13, 1982
Accepted on April 7, 1982
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