A team of scientist from Europe have said there findings revealed that people with Type A blood have a higher risk of catching coronavirus and of developing severe symptoms, while people with Type O blood have a lower risk.
According to these scientist found two genetic variations that may show who is more likely to get very sick and die from coronavirus, and they say they have also found a link to blood type.
They said this probably point to a possible explanation for why some people get so seriously ill with the virus, while most barely show any symptoms at all.
In a report published by them, they said, “Our genetic data confirm that blood group O is associated with a risk of acquiring Covid-19 that was lower than that in non-O blood groups, whereas blood group A was associated with a higher risk than non-A blood groups”.
They found people with Type A blood had a 45% higher risk of becoming infected than people with other blood types, and people with Type O blood were just 65% as likely to become infected as people with other blood types.
The team led by Andre Franke, a professor of molecular medicine at the University of Kiel in Germany, studied more than 1,900 severely ill coronavirus patients in Spain and Italy, and compared them to 2,300 people who were not sick.
They did what’s known as a genome-wide association study, trawling through the entire genetic map to find two DNA variations that were more common in the sickest patients.
They said, “We detected a novel susceptibility locus at a chromosome 3p21.31 gene cluster and confirmed a potential involvement of the ABO blood-group system in Covid-19,” the. And two places in the genome were linked with the risk of developing respiratory failure.
The researchers cannot say if blood type is a direct cause of the differences in susceptibility. It might be that the genetic changes that affect someone’s risk also just happen to be linked with blood type, they said.
However, Dr. Roy Silverstein, a hematologist who is the chairman of the department of medicine at the Medical College of Wisconsin, says the blood type link is plausible.
The genes that control blood type also affect structures called sugars on the surfaces of cells, which in turn could affect the ability of the virus to infect those cells, he said.
Plus, blood type is linked with the risk of developing blood clots, and it’s now clear that severe coronavirus infections are marked by unusual blood clotting throughout the body.
Silverstein, a past president of the American Society of Hematology, said the findings mean very little for the average person.
While the increased risk may sound large, over a whole population of people it’s not much at all.
The researchers maintain that the findings would be more useful for designing drugs or vaccines against coronavirus, they say going forward.