IFNG and pelvic inflammatory disease: Post-vaccine results showed a positive cellular response in 18 out of 20 (90%) PID patients with median (IQR) IFN-γ levels of 1694.1 (651.5–1856.5) mUI/mL and in 74 out of 81 (96%) HCs with median (IQR) IFN-γ levels of 1908.5 (1149.5–2001.0) mUI/mL, with significant differences (p = 0.005) (Figure 2B).