A study conducted in the United States, which looked at about 107,000 patients, revealed that blood type is not associated with an increased risk of contracting Covid-19. The research, published on Monday (5), in the academic journal JAMA, is authored by researchers at the University of Utah, the Intermountain Medical Center Heart Institute and Stanford University.
The researchers realized that patients with blood type A were not at greater risk of testing positive for the disease, nor were they more likely to be hospitalized or admitted to the ICU (Intensive Care Unit), when compared to type O individuals. link between type B or AB people and a greater number of Covid-19 cases.
To reach these conclusions, patient data from the Intermountain Healthcare health system, which comprises 24 hospitals and 215 clinics in the US states of Utah, Idaho and Nevada, were used. All information was from the period from March 3 to November 2, 2020.
The data included people who had their blood type registered and were tested for the Covid-19 virus, Sars-CoV-2. Of the total of 107,796 thousand individuals, 11,468 tested positive for the coronavirus. The average age of the patients was 42 years and the majority, 77%, were white women.
On the other hand, the researchers noted that, among the patients, most of them who needed hospitalization and admission to the ICU were older men. Furthermore, people of African American, Indian American or Alaskan, Hawaii and Pacific Islander origins had a 13.9% risk of testing positive for Covid-19, while white individuals only had 6.9% this incidence.
The risk of needing hospitalization was also much higher for people of non-white origin (23.9%), when compared to whites (11.3%). This lack of representativeness of the study is pointed out by the researchers, who cite that the population of Utah is dominated by ancestors from northern Europe, with a minority contribution from Hispanics / Latinos and other ethnicities.
The article also contradicts an earlier survey of 1,980 Spanish and Italian patients and led by the University of Kiel in Germany. The study, released in June last year, said that blood type O was supposedly linked to a lower risk of contracting the disease, while in blood group A, there was a greater predisposition.
However, the scientists explain in the new study that previous conflicting results may be linked to a number of factors, such as the heterogeneity of associations between blood types, in addition to the study publication bias, genetic history, sample geography and strains viruses considered.
Still, they argue that their current conclusions are reliable. “We believe that important associations of Sars-CoV-2 and Covid-19 with ABO groups are unlikely and will not be useful factors associated with the susceptibility or severity of the disease at any of the individual or population levels for similar environments and ancestors,” they wrote. The researchers.
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