Amongst the 893 PID patients with a genetic defect, 2 (0.2%) were recorded to have been tested neonatally and 9 (1%) prenatally (6 DGS patients with Del 22q11.2, 1 SCID patient with RAG1 and 1 ALPS patient with a FAS (TNFRSF6) mutation). The gene discussed is FAS; the disease is pelvic inflammatory disease.