TLR9 and cytomegalovirus infection: Considering TLR9 SNP, the GA heterozygotes, when compared to AA and GG homozygotes, were significantly more frequent in the infected patients than in the controls, and increased the risk of HCMV infection (OR 4.81, 95% CI 1.14–20.25; P≤0.050 in the overdominant model).