Your Blood Type May Predict Your Risk For Severe COVID-19

“Long Covid” could be a cyclical disease that moves in body

A preprint study published in March this year suggested that people with blood type A have a higher risk of acquiring Covid-19 compared with non-A blood groups, while another study published in June found that blood type O seemed to be more resistant against Covid-19 infection.

The results suggest that COVID-19 patients with A and AB blood types may have an increased risk of organ dysfunction or failure than those with type O or B blood, according to the researchers.

When researchers parsed through data from the Danish health registry of more than 473,000 people tested for COVID-19 and compared it to a control group of over 2.2. million people from the general populace, they found that among COVID-positive patients, there were fewer with blood type O and more with blood types A, B and AB.

While type O blood may provide small benefits during the pandemic, another study in Blood Advances finds patients with A and AB blood may see worse symptoms. It could be, for example, that a certain ethnic group is at a higher risk of catching Covid-19 and they incidentally are likely to share a certain blood type. A study published in July looking at patients in five major hospitals in the state of MA found that people with blood type O were less likely to test positive for COVID-19 than those with other blood types.

More patients with type A and AB blood required dialysis for kidney failure, the study added.

In a second study also published on Wednesday, Canadian scientists examined 95 COVID-19 patients in Vancouver between February and April. The findings indicate why the coronavirus is lethal for some and not so for the others.


Lead author of the study, Dr Mypinder Sekhon, of the University of British Columbia, said: "The unique part of our study is our focus on the severity effect of blood type on COVID-19".

People with blood group O positive can donate blood only to people with positive blood groups like A+, B+, O+, AB+.

It's important to emphasize that the type of reduction in risk achieved with appropriate physical distancing, wearing a mask, and hand hygiene are significantly better than depending on your blood group for protection, so people with blood type O should not be complacent about public health advice.

Meanwhile, the scientists noted in the study, "We observed dis lung and kidney damage, and in future studies, we will want to tease out the effect of blood group and COVID-19 on other vital organs".

Patients receive treatment in an intensive care unit of the Central Clinical Hospital "RZD-Medicine", which delivers medical aid to people infected with the coronavirus disease (COVID-19), in Moscow, Russia, May 18, 2020.

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