They found that patients with blood groups A or AB were more likely to require mechanical ventilation, suggesting that they had greater rates of lung injury from COVID-19. Researchers examined data from 95 critically ill COVID-19 patients hospitalized in Vancouver, Canada. “We have the advantage of a strong control group – Denmark is a small, ethnically homogenous country with a public health system and a central registry for lab data – so our control is population-based, giving our findings a strong foundation.”īlood groups A and AB associated with increased risk of severe clinical outcomes of COVID-19 infection People with blood groups A or AB appear to exhibit greater COVID-19 disease severity than people with blood groups O or B, according to a separate retrospective study. “It is very important to consider the proper control group because blood type prevalence may vary considerably in different ethnic groups and different countries,” said study author Torben Barington, MD, of Odense University Hospital and the University of Southern Denmark. ![]() Since blood group distributions vary among ethnic subgroups, the researchers also controlled for ethnicity and maintained that fewer people with blood type O tested positive for the virus. The researchers did not find any significant difference in rate of infection between A, B, and AB types. The study results suggest that people with blood types A, B, or AB may be more likely to be infected with COVID-19 than people with type O. Among the COVID-19 positive, they found fewer people with blood type O and more people with A, B, and AB types. Researchers compared Danish health registry data from more than 473,000 individuals tested for COVID-19 to data from a control group of more than 2.2 million people from the general population. Individuals with blood type O may be less vulnerable to COVID-19 infectionīlood type O may offer some protection against COVID-19 infection, according to a retrospective study. These new studies add evidence that there may be an association between blood type and vulnerability to COVID-19 however, additional research is needed to better understand why and what it means for patients. The potential role of blood type in predicting risk and complications of COVID-19 infection has emerged as an important scientific question. As the pandemic continues, the global biomedical research community is working urgently to identify coronavirus risk factors and potential therapeutic targets.
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