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Home COVID-19

Case study: People with blood type O may have lower risk of Covid-19 infection and severe illness.

Neushub Digital by Neushub Digital
October 18, 2020
in COVID-19, Life Style
0
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People with blood type O may be less vulnerable to Covid-19 and have a reduced likelihood of getting severely ill, according to two studies published Wednesday.

Experts say more research is needed.The research provides further evidence that blood type (also known as blood group) may play a role in a person’s susceptibility to infection and their chance of having a severe bout of the disease. The reasons for this link aren’t clear and more research is needed to say what implications, if any, it has for patients.

A Danish study found that among 7,422 people who tested positive for Covid-19, only 38.4% were blood type O — even though, among a group of 2.2 million people who were not tested, that blood type made up 41.7% of the population.By contrast, 44.4% of group A tested positive, while in the wider Danish population that blood type makes up 42.4%.In the other study, researchers in Canada found that among 95 patients critically ill with Covid-19, a higher proportion with blood type A or AB — 84% — required mechanical ventilation compared with patients with blood group O or B, which was 61%.

The Canadian study also found those with blood type A or AB had a longer stay in the intensive care unit, a median of 13.5 days, compared with those with blood group O or B, who had a median of nine days.”As a clinician … it is at the back of my mind when I look at patients and stratify them. But in terms of a definitive marker we need repeated findings across many jurisdictions that show the same thing,” said Dr. Mypinder Sekhon, an intensive care physician at Vancouver General Hospital and an author of the Canadian study.”I don’t think this supersedes other risk factors of severity like age and co-morbities and so forth,” added Sekhon, who is also a clinical assistant professor in the Division of Critical Care Medicine and Department of Medicine at the University of British Columbia.”If one is blood group A, you don’t need to start panicking. And if you’re blood group O, you’re not free to go to the pubs and bars.”

No need to worry

Most humans fall into one of four blood groups: A, B, AB or O. In the United States, the most common blood groups are O and A.It makes very little difference to most people’s daily lives unless you have to have a blood transfusion. Nor should people worry unduly about the link between blood type and Covid-19, said Dr. Torben Barington, the senior author of the Danish paper and a clinical professor at Odense University Hospital and the University of Southern Denmark.

“We do not know whether this is some kind of protection of group O, or whether it’s some kind of vulnerability in the other blood groups,” he said.”I think this has scientific interest, and when we find out what the mechanism is, perhaps we’re able to use that proactively in some way in regard to treatment.”In the Danish study, researchers analyzed data on Danish individuals who were tested between February 27 and July 30, and the distribution of blood types among those people was compared with data from people who had not been tested. They found that blood group wasn’t a risk factor for hospitalization or death from Covid-19.Both studies were published in the journal Blood Advances.While there are several theories, researchers don’t yet know what mechanism could explain the link between different blood groups and Covid-19.

Sekhon said it could be explained by people with blood type O having less of a key clotting factor making them less prone to coagulation problems in the blood. Clotting has been a major driver of the severity of Covid-19.Other possible explanations involve blood group antigens and how they affect the production of infection fighting antibodies. Or it could be linked to genes associated with blood types and their effect on receptors in the immune system.”It’s a repeated, interesting scientific observation that really warrants further mechanistic work,” he said.

Neushub Digital

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