Expectedly, APOE SNP rs429358, which, in combination with rs7412, is responsible for the formation of three main APOE alleles, was associated with both COVID-19 and AD (highest value of ps extracted from GWAS catalog were equal to 1 × 10−44 and 2 × 10−303, respectively); no significant shared SNPs were found for other genes. The gene discussed is APOE; the disease is Alzheimer disease.