A group of University of Bologna has evaluated the effects of ABO blood types on the risk of infection with the new coronavirus (COVID-19) using 7,503 cases and 296,216 controls.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7500631/
The reported results are as follows,
Type A: OR: 1.23 (95% CI: 1.09-1.4)
Type B: OR: 1,05 (95% CI: 0.96-1.15)
AB Type: OR: 1.09 (95% CI: 0.94-1.26)
Type O: OR: 0.77 (95% CI: 0.67-0.88)
Further, a group of Sakarya University has reported that the Rh+ blood group was found in a significantly high number of patients who were admitted to ICU.
https://pubmed.ncbi.nlm.nih.gov/32965363/