Blood IFNβ levels were 1.2 pg/mL (i.e., the detection limit) or lower in 81.8% of the viral infection group (n = 9/11), 46% of the bacterial infection group (n = 6/13), and 77% of the non-infection group (n = 7/9) (Table 2). The gene discussed is IFNB1; the disease is infection.