Introduction: It has been found that the viral infection is linked to the ABO\nblood group. Limited studies investigated the relationship of the ABO blood\ngroup and susceptibility to COVID-19 infection. Objective: To investigate\nthe association between the ABO blood group and the COVID-19 susceptibility.\nMaterial & Methods: The study is a retrospective cohort study. It included\nall hospitalized confirmed COVID-19 patients in Qatif central hospital,\nEastern province, Saudi Arabia. We included both genders and people who\nare older than 14 years of age. The study was conducted in the period between\n15th March, and 15th April, 2020. Results: Our sample consists of 72\npatients; we found a percentage distribution of 23.62%, 33.33%, 9.72%, and\n33.33% for blood groups A, B, AB and O, respectively. Our results showed\nsignificantly increased risk for AB blood groups....................
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