Type O, Rh- blood may be linked to lower COVID-19 risks: Stu
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Having O and rhesus-negative, or Rh-, blood was associated with a slightly lower risk for COVID-19 infection and severe illness or death, according to research published in Annals of Internal Medicine.

Researchers conducted a population-based, retrospective cohort study of adults and children in Ontario, Canada, who had their blood group assessed from 2007 through 2019 and who were later tested for SARS-CoV-2 using viral RNA polymerase chain reaction testing from mid-January through June.

A total of 225,556 people who had an ABO blood group test and a SARS-CoV-2 laboratory test were included in the study.

Of those, 36.3% had type A blood, 4.5% had type AB blood, 14.9% had type B blood and 44.3% had type O blood. Of participants, 13.1% had Rh- status.

According to the researchers, those with type O blood had a lower risk for severe COVID-19 or death compared with all other blood types.

Compared with those who had Rh-positive blood, those with Rh– blood were also found to have a lower risk for severe COVID-19 or death.

Conclusion: The O and Rh- blood groups may be associated with a slightly lower risk for SARS-CoV-2 infection and severe COVID-19 illness.

Source: https://www.acpjournals.org/doi/10.7326/M20-4511
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