Preliminary studies in China suggest that blood group is a factor in how the COVID-19 affects population.
"A" seems to be the most affected, with increased risk of complications and need for extra care.
"0" is the less affected by the virus.
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The proportion of blood group A and O in COVID-19 patients were significantly higher and lower, respectively, than that in normal people (both P < 0.001). Similar ABO distribution pattern was observed in 398 patients from another two hospitals in Wuhan and Shenzhen. 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
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Source:
https://www.medrxiv.org/content/10.1....11.20031096v1