Blood Type O more likely resistant to coronaviruses?

UPDATE:

COVID-19 and Blood Types: Higher Risk for Blood Type A, Lower Risk for Blood Type O

Though this older study isn’t about COVID-19, it still is interesting:

Severe acute respiratory syndrome (SARS) is caused by the SARS coronavirus (SARS-CoV), an RNA virus. The original SARS outbreak in the winter of 2002 to 2003 infected >8,000 individuals worldwide, with a fatality rate of 10% (292). Like other human coronaviruses, SARS-CoV infects the mucosal epithelium, causing an acute respiratory illness often accompanied by gastroenteritis. In a Hong Kong outbreak, there was an apparent association between disease transmission and ABO type (293). An epidemiology study of 34/45 hospital workers who contracted SARS after exposure to a single index patient showed that most of the infected individuals (23/34) were non-group O individuals (groups A, B, and AB). Group O individuals were relatively resistant to infection, with an OR of 0.18 (95% CI, 0.04 to 0.81; P = 0.03).

https://cmr.asm.org/content/28/3/801

… and then there is the Rh factor:

See also:

Infections of viral origin and Rh(D) negative blood

Blood Type O Most Protected From Malaria, Blood Type A The Worst