COVID-19: This one blood group is less vulnerable to coronavirus

An illustrated COVID-19 virus pattern over three blood drops labeled A B and O. The virus pattern is faded over the O drop

An illustrated COVID-19 virus pattern over three blood drops labeled A B and O. The virus pattern is faded over the O drop

This is according to two recently published studies.

A recent preliminary study from South Korea surveyed 65 recovered Covid-19 patients and found that 91.1 percent of them were suffering from at least one lasting side-effect, most often tiredness followed by lack of concentration or so-called "brain fog."

The two studies together show that blood groups A and AB are particularly at risk of organ failure due to COVID-19 as compared to blood types O and B.

However, blood types A and AB are at most risk and vulnerable to the infection.

In the first study, researchers compared Danish health registry data from over 473,000 individuals tested for COVID-19 to data from a control group of more than 2.2 million people from the general population.

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One of the new studies specifically found that COVID-19 patients with Type O or B blood spent less time in an intensive-care unit than their counterparts with Type A or AB.

They also controlled for ethnicity, as blood group distributions differ among ethnic groups, and maintained that fewer people with blood type O tested positive for Covid-19. "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 from the University of Southern Denmark.

People with type A blood, however, accounted for 44.4% of the infected patients, the study found, despite making up 42.4% of the untested group.

Researchers also found the blood type A or AB group had longer stays in the intensive care unit, a median of 13.5 days, compared to the other group with blood type O or B who had a median of 9 days. For those who were inflicted by the virus, type A was 38 per cent, type B was 26 per cent, type AB was 10 per cent, and type O was 25 per cent.

These new findings echo similar findings about Type O blood seen in previous research, creating a clearer picture of one particular coronavirus risk factor.

However, both studies' authors note several limitations that warrant consideration, and suggest further research to confirm these findings and enhance scientists' understanding of blood type association to Covid-19 severity.

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