Paper: https://www.medrxiv.org/content/10.1101/2020.03.11.20031096v1 https://www.medrxiv.org/content/10.1101/2020.03.11.20031096v... Meta-analyses on the poole

Paper: https://www.medrxiv.org/content/10.1101/2020.03.11.20031096v1 https://www.medrxiv.org/content/10.1101/2020.03.11.20031096v... 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 As far as I can tell, O group had less infections and also less severe symptoms and deaths if infected.