Your blood type may determine how sick you get from COVID

Immunity against coronavirus lasts up to 7 months claims Indian-origin researcher

Types A and AB were also more likely to need a type of dialysis that helps the kidneys filter blood without too much pressure on the heart.

According to the American Red Cross, O-positive is the most common type of blood across all races.

Still, a second smaller study also published Wednesday seems to boost those findings. Of the 95 patients critically ill with Covid-19, a higher proportion with blood group A or AB (84 percent) required mechanical ventilation compared to patients with blood group O or B (61 percent). They discovered that blood types A and AB were at a greater risk of severe symptoms than the O or B blood types. The latter group stayed, on average, 13.5 days in the ICU. The researchers did not see any link between blood type and the length of each patient's total hospital stay, however.

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.

In two of such researches, the scientists have found out that a person's blood type can play a very important role in one's vulnerability towards the novel coronavirus.

The second research is based on almost 95 people from Vancouver, Canada who had tested positive for the virus.

That's lower than the prevalence of Type O in a population of 2.2 million Danish people, 41.7 percent, so the researchers determined that people with Type O blood had disproportionately avoided infection. "And if you're blood group O, you're not free to go to the pubs and bars".

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. There is zero indication that any blood type is either totally protective or dooms a patient to severe outcomes of COVID-19.

"Blood type O is significantly linked to a reduced susceptibility to SARS-CoV-2 infections", the study authors wrote, which means that people with type O blood appear to be less likely to become infected.

"The study suggests if you have type O, you have a slightly lower risk", Dr. Roy Silverstein, chair of medicine at the Medical College of Wisconsin, said.

Despite this growing body of evidence, however, Mypinder Sekhon, a co-author of the Vancouver study, said the link is still tenuous.

The trends remained unaffected after the researchers factored in ethnicity, which affects blood group distributions.

"If one is blood group A, you don't need to start panicking".

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