A recent study that analysed the data of Covid-19, found that those with type A blood were at increased risk for respiratory failure. The study analysed the patients hospitalized for Covid-19 and found that those who had Type A blood were more likely to have severe disease while those with Type O were less likely. It also involved scientists in Italy, Spain, Denmark, Germany and other countries who compared about 2,000 patients with severe Covid-19 These studies all highlight a set of six genes located on the chromosome near the region that encodes the ACE2 protein, the receptor of SARS-CoV-2. However, the findings are still far from absolute as some patients with blood type O still suffered respiratory failure, while some with type A did not.
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