TLR9 and cytomegalovirus infection: Our study explored the genotype distribution of TLR9 -1237T/C (rs5743836), -1486T/C (rs187084), 1174G/A (rs352139), and 2848C/T (rs352140) SNPs in infants and the correlation between polymorphisms in the TLR9 gene and HCMV infection in infants.