January 2020 Studies showed Elite Blood types Rh-Negative and O have far greater immunity from CV19 – Estie Mermelstein, MSN, FNP-BC

https://www.infectiousdiseaseadvisor.com/home/topics/covid19/o-negative-blood-had-lowest-probability-of-coronavirus-infection-abo-blood-types/#:~:text=Patients%20with%20type%20O%20and,the%20Annals%20of%20Internal%20Medicine.