TLR9 and cytomegalovirus infection: Regarding the TLR9 gene, the presence of the minor allele in homozygous or heterozygous states was associated with the occurrence of CMV infection, both for rs5743836 (64.8% for AG/GG versus 51.7% for AA; P-value = 0.1) and rs352139 (61.6% for TC/CC versus 40.7% for TT; P-value = 0.007), indicative of a dominant risk conferring effect (Table 3).