Genes associated with certain blood types may increase the risk of severe COVID-19 infections, leading to respiratory failure and death, a new study suggests. 

The study authors found that people with blood type A were 50% more likely than people with other blood types to experience severe COVID-19 symptoms and respiratory failure. By comparison, people with blood type O had a 50% reduced risk of developing severe symptoms of COVID-19 — the disease caused by the novel coronavirus —  or those severe enough to require oxygen or a ventilator. 

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