The ABO group in 3694 normal people in Wuhan showed a distribution of 32.16%,
24.90%, 9.10% and 33.84% for A, B, AB and O, respectively, versus the distribution
of 37.75%, 26.42%, 10.03% and 25.80% for A, B, AB and O, respectively, in 1,775
COVID-19 patients from Wuhan Jinyintan Hospital.
[...]
Meta-analyses on the pooled data showed that blood group A had a significantly
higher risk for COVID-19 (odds ratio-OR, 1.20; 95% confidence interval-CI
1.02~1.43, P = 0.02) compared with non-A blood groups, whereas blood group O had
a significantly lower risk for the infectious disease (OR, 0.67; 95% CI 0.60~0.75, P <
0.001) compared with non-O blood groups.