According to GeneAtlas, FYCO1 variant rs33910087 is a highly significant modifier of monocyte percentage (p = 3.85 × 10−46), and based on GTEx v8, this variant is also an eQTL for several protein-coding genes previously associated with COVID-19 (CXCR6, FYCO1, SLC6A20, CCR1, LZTFL1). Here, SLC6A20 is linked to COVID-19.