Blood system ABO antigens as risk factor for severity of SARS-CoV-2 infection.

Introduction: Whether there is an influence of the ABO blood system on SARS-CoV-2 infection is unknown.

Objective: To analyze if there is an association between the ABO system antigens and susceptibility to and severity of SARS-CoV-2 infection.

Material And Methods: The frequency of ABO system antigens was compared in 73 confirmed cases of SARS-CoV-2 infection and 52 clinically healthy donors.