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One study found that people with blood type O are 12% less likely to have coronavirus, compared to other blood types.
The results also reveal that those who have a negative blood type (O-, A-, B- or AB-) are, on average, 21% less likely to contract the virus compared to people with the positive type .
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People with type O or negative blood were 13% and 19% less likely to have severe symptoms or death, respectively.
The study says that about one in eight people (13%) who carry O- are 26% less likely to have the infection and 28% less likely to have severe symptoms or death.
Researchers at the Institute of Osteopathic Clinical Sciences in Toronto studied 225,556 people who had a blood test between 2007 and 2019 and a “Covid-19” swab this year.
Each person has one of four blood types, A, B, AB, or O. The difference in blood groups depends on the presence or absence of specific junctions on red blood cells called antigens. The presence or absence of these antigens is what determines a person’s blood type.
The researchers analyzed the medical records of more than 225,000 participants who had undergone the ABO blood type test and the SARS-CoV-2 test, and of these, 36.3% had blood type A, the 4.5% had AB, 14.9% had B, and 44.3%. % They have type O.
Statistical analysis took into account all other variables and comorbidities, and found that the relative risk of SARS-CoV-2 infection is 15% higher in type AB compared to type A.
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The researchers also found that the risk of infection with type O is 5% lower than with type A, but compared to all blood types, it increases to 12%.
“There were 1,328 COVID-19 cases with severe illness or death, with a higher probability among blood groups AB and B, as well as those with Rh + (Rh positive blood group),” the researchers wrote.
And people who have type B blood have a 21% risk of developing serious disease after infection with “Covid-19”, of those who have type A.
In this study, which was conducted within a comprehensive health care system with a large scale SARS-CoV-2 test, blood group O and the Rh – blood system were associated with a slightly reduced risk of developing a SARS-CoV-2 infection, as well as severe Covid-19 illness. Death for it, ” according to study results published in the Annals of Internal Medicine.
The results are consistent with previous research from China that found a similar protective effect for some blood types.
Researchers evaluated 2,173 people diagnosed with the coronavirus, including 206 people who died after contracting the virus, at three Hubei hospitals.
The academics compared data from infected patients from Wuhan with 3,694 uninfected people in the same region.
Of the 206 patients who died, 85 had blood type A, which is equivalent to 41% of all deaths.
Source: Daily Mail
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