Risk of COVID-19 Infection with Blood Type
Analyses indicated that ABO blood type independently predicted COVID-19 infection (Table 3). At crude analyses, blood type A and O significantly predicted the risk of COVID-19 infection. After controlling for significant confounders (age and COVID-19 vaccination), the adjusted risk for COVID-19 infection was 20% higher among blood type A (aRR=1·20, p =0·021) than non-A blood type. In contrast, those with blood type O (aRR=0·85, p =0·023) were 19% at lower risk than non-O blood type.
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