Emerging studies include those from Ellinghaus et al. [6], who conducted a genome-wide association study (GWAS) of COVID-19 cases and identified two loci that achieved genome-wide significance: the blood type ABO locus on chromosome (chr) 9, and a cluster of immune functions genes on chr 3 (candidate gene SLC6A20). The gene discussed is SLC6A20; the disease is COVID-19.