With regard to laboratory tests, the rates of eosinopenia (0.2(0.1, 0.5) vs 0.8(0.4,2.5), P<0.001), hypoalbuminea (30.09 ± 5.10 vs. 34.67 ± 6.61, P<0.001), low IgA (1.91(1.21,2.29) vs 2.30(1.83, 2.82), P = 0.011), low IgM (0.52(0.40,0.89) vs. 0.89 (0.68, 1.86), P = 0.002), low IgG (8.9 (6.28, 11.79) vs. 12.34 (9.40, 16.20), P = 0.001), high-sensitivity C-reactive protein (hsCRP) (42.67 (17.16, 74.65) vs. 9.92 (3.68, 37.71), P = 0.001), and hyponatremia (136.41 ± 3.70 vs. 138.42 ± 2.98, P = 0.001) in the active CMV infection group were higher than those in the noninfection group. This evidence concerns the gene CD40LG and cytomegalovirus infection.