And a Danish study found that it was among 7,422 people who tested positive With a virus Corona, only 38.4 percent of them had blood type O, although out of a group of 2.2 million people who had not been tested, blood type made up 41.7 percent of the population. In contrast, 44.4 percent of group A had tested positive, while the blood group in the broader Danish population made up 42.4 percent.
And in another study conducted in Canada, researchers found that it was among 95 patients with a critical condition due to: Epidemic Covid-19, the highest percentage of them belong to blood type A or AB, and 84 percent of them required mechanical ventilation compared to patients belonging to blood type O or B, which was 61 percent.
The Canadian study also found that those with blood type A or AB spent longer in the ICU, with an average of 13.5 days, compared to those with blood type O or B, who had an average stay in the ICU. care Concentrated nine days.
Dr. Maybinder Sikhon, intensive care physician at Vancouver General Hospital and author of the Canadian study said, “As a physician, I am in the back of my mind when I look at patients and divide them into layers. But in terms of the final score, we need repeated results across many jurisdictions that Show the same thing, ”an intensive care physician at Vancouver General Hospital and author of the Canadian study. “I don’t think this replaces the other severe risk factors,” Sikhon added As old And so on. ”Sikhon said,“ If one of them is blood type A, don’t panic, and if you are blood type O, you are not free to go to bars and clubs. ”
Most people are classified into one of four blood groups: A, B, AB, or O. In the United States, the most common blood types are O and A, and the difference does not make much difference in most people’s daily lives unless a transfusion is required. Dr Turpin Barrington, senior author of the Danish study and clinical professor at Odense University Hospital and University of Southern Denmark, stressed that people should not be unduly concerned about the link between blood type and the Covid-19 virus. “We don’t know if this is some kind of protection for group O, or if it’s some kind of weakness in other blood groups,” he said, adding, “I think this has scientific interest, and when we discover the mechanism, maybe we can use that proactively in some way. Regarding treatment. ”
In the Danish study, researchers analyzed data from Danish individuals who were tested between February 27 and July 30, and the distribution of blood types among these people was compared with data from people who had not been tested. They found that blood type was not a risk factor for hospitalization or death from Corona.
While there are several theories as researchers do not yet know the mechanism that could explain the link between different blood groups and COVID-19. Sikhon noted that this could be explained by the premise that people with blood type O had less than one factor Thrombosis The main one making them less likely to have blood clotting problems. Coagulation was a major driver of COVID-19 severity.
Other possible explanations include blood type “antigens” and how they affect the production of antibodies to fight infection, or they could be linked to genes linked to blood types and affect receptors in the immune system. “It’s a very frequent and interesting scientific observation that really requires more robotic work,” Sikhon said.
The results of the two new studies provide “more converging evidence that blood type may play a role in a person’s susceptibility to infection With a virus Corona and its chances of having a severe attack from Covid-19, “said Dr. Amish Adalja, a senior researcher at Johns Hopkins University’s Center for Health Security in Baltimore, who was not involved in any of the studies.
A separate study published in the New England Journal of Medicine in June found that genetic data in some patients Covid-19 And healthy people indicated that those with type A blood were more likely to develop the infection, and that those with type O blood were at a lower risk.
Adalja, whose work focuses on emerging infectious diseases, said the previous genetic study, coupled with the two new studies “suggests that this is a real phenomenon that we’re seeing. Although we haven’t quite reached the point where this is a drastic thing, it is clearly suggestive, and we haven’t seen it. Anything that contrasts with this. The same pattern has emerged with blood type O which tends to be the one that stands out. ”
Adalja said that blood types and their exposure to various infections have been studied in the medical literature before. For example, research indicates that people with blood type O appear to be more likely to develop a norovirus infection.
According to Adalja, for the new coronavirus that causes Covid-19“We need to know the mechanism and understand it at the molecular level so that we can determine how this happens with certainty, and this is really blood type O and nothing that kind of pathways with blood type”, Adalja added: “We’re starting to see enough now that I think It’s an important research question that must be answered … There is more science to be done, but it seems to me that there is more evidence accumulating for this hypothesis.
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