The ABO and rhesus (Rh) blood groups may influence risk for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. The O and Rh− blood groups may be associated with a slightly lower risk for SARS-CoV-2 infection and severe COVID-19 illness. https://www.acpjournals.org/doi/10.7326/M20-4511 The above study is not brand new, but new enough. As I am searching for any study I may have missed when first published, please use the comment section to bring to my attention whatever significant updates could be of interest to our readers. Thank you for all of your ongoing support.