"Patients with type O and rhesus negative (Rh-) blood groups may have a lower risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and severe coronavirus disease 2019 (COVID-19) illness, according to a study published in the Annals of Internal Medicine"
First paragraph says it all. The rest of the article explains it in more detail.
O+ and any Rh-blood types except O- provide the most protection against severe infection.
You must not have read the article.
"Patients with type O and rhesus negative (Rh-) blood groups may have a lower risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and severe coronavirus disease 2019 (COVID-19) illness, according to a study published in the Annals of Internal Medicine"
First paragraph says it all. The rest of the article explains it in more detail.
O+ and any Rh-blood types except O- provide the most protection against severe infection.