Patients with PJP had lower body mass index (21 vs. 25, p < 0.001), lower albumin levels (2.7 g/dL vs. 3.2 g/dL, p < 0.001), and greater incidence of lymphopenia (<1000/mcl) (80.3% vs. 46.5%, p < 0.001). The gene discussed is ALB; the disease is pneumocystosis.