Table I. Donor characteristics.

	HCMV− (n = 97)	HCMV+ (n = 55)
Median age, y (range)	32 (20–70)	35 (21–77)
Female sex, n (%)	73 (75)	32 (58)
NKG2C genotype +/+, +/−, −/−, n (%)	67/24/2 (72/26/2)	35/17/2 (65/31/4)
NKG2C− haplotype frequency (%)	15.0	19.4
Median anti-HCMV IgG titer, IU/ml (range)	<0.25	394.2 (31.1–4411.6)
Median anti-PT IgG titer, IU/ml (range)	6.7 (0.5–139.3)	5.0 (0.8–179.9)
Median anti-H1N1 IgG titer, AEUs (range)	214.6 (80.7–953.2)	190.1 (90.2–522.7)

Donors were classified as HCMV⁻ and HCMV⁺ by anti-HCMV IgG ELISA, using 0.25 IU/ml as the cutoff per manufacturer’s instructions. NKG2 genotype (NKG2C^+/+, NKG2C^+/−, NKG2C^−/−) was determined by PCR. IgG Ab titers against PT and H1N1 were calculated from interpolation of a reference serum or high-titer donor standard curve, respectively.