ACE2 and infection: ACE2-rs2285666 (C>T) and ACE2-rs2106809 (A>G) have been recognized as important SNPs that regulates ACE2 expression levels, which may, in turn affect the number of available receptor sites for SARS-CoV-2 virus attachment to cause an infection, thereby potentially conferring resistance to infection (Dhangadamajhi et al., 2010; De et al., 2021).