In the name of fairness, I will post many articles and studies related to blood types and COVID-19, even when there are flaws.
I am convinced, that many readers are able to on their own to determine what is the truth.
Here is yet another study I might have missed when it was first published:
To evaluate the influence of ABO and Rh blood groups on morbidity among SARS-CoV-2 infected pregnancies.
This is the first prospective study with multivariable analysis to evaluate the association of ABO and Rh blood group with medical and obstetric morbidity in SARS-CoV-2 infected mothers. We found that the Rh− status was associated with a lower risk of symptomatic COVID-19 after adjusting for maternal age and ethnicity. In terms of perinatal outcomes, blood group A was associated to PPROM, and regarding obstetric complications Rh+ patients developed more hemorrhagic events, in particular, more postpartum hemorrhage.
According to our study the presence of Rh− status was protective in terms of development of symptomatic COVID-19 after adjusting for maternal age and ethnicity. In terms of perinatal and obstetric outcomes, blood group A was associated to PPROM and Rh+ patients developed more hemorrhagic events, in particular, more postpartum hemorrhage.
See the study:
Association of ABO and Rh blood groups with obstetric outcomes in SARS-CoV-2 infected pregnancies: A prospective study with a multivariate analysis