[Deficiency of C2 component in a 9-year old girl]

The authors describe a 9 year-old girl with homozygous deficiency of C2 component, causing null activity of the classical pathway of complement. The girl suffered from several recurrent infections since birth, later developed signs of the Henoch-Schönlein disease. At the age of 1 1/2 years she was hospitalized due-to bacterial meningitis, most probably of Neisseria meningitis etiology.