The authors speculated on two possible causes of the lower prevalence of SARS-CoV-2 infection in the blood group O population. The first is that anti-A and anti-B antibodies may have an effect on neutralizing SARS-CoV viruses and that anti-A and anti-B are present on mucosal surfaces in some individuals lacking the corresponding ABO blood group. The second is that the association between ABO blood groups and levels of von Willebrand factor, which is higher in non-O individuals and is tied to an increased likelihood of arterial and venous thrombosis, could have an indirect or unknown impact on susceptibility to infection, according to the authors.

Blood Group O Linked to Decreased Risk for SARS-CoV-2 Infection – Medscape – Oct 15, 2020. SOURCE: Barnkob MB et al. Blood Adv. 2020 Oct 14. doi: 10.1182/bloodadvances.2020002657. — https://www.medscape.com/viewarticle/939216?src=rss

I am Oriental Positive.