APOE and infection: As alleles ɛ2, ɛ3 and ɛ4 in APOE gene correspond to genotypes rs7412-T/rs429358-T; rs7412-C/rs429358-T; and rs7412-C/rs429358-C, respectively, we evaluated the combination of the two SNPs rs7412 and rs429358 in the risk of infection.