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Blood type could be linked to Covid-19 risk and severity, new research suggests

October 14, 2020. Summarized by summa-bot.

WASHINGTON, DC - JUNE 16: Residents have their blood drawn by registered nurse Barbara Davis for an antibody test for the coronavirus, also called a serology test, June 16, 2020 in Washington, DC. Serology tests are intended for persons who are not currently experiencing signs and symptoms of COVID-19, but want to know if they were previously exposed to the virus. (Photo by Win McNamee/Getty Images)

People with blood group O may be less vulnerable to Covid-19 and have a reduced likelihood of getting severely ill, according to two studies published Wednesday, that add to evidence that blood type may play a role in a person's susceptibility to the disease.

(CNN)People with blood type O may be less vulnerable to Covid-19 and have a reduced likelihood of getting severely ill, according to two studies published Wednesday.

A Danish study found that among 7,422 people who tested positive for Covid-19, only 38. 4% were blood type O -- even though, among a group of 2. 2 million people who were not tested, that blood type made up 41. 7% of the population.

In the other study, researchers in Canada found that among 95 patients critically ill with Covid-19, a higher proportion with blood type A or AB -- 84% -- required mechanical ventilation compared with patients with blood group O or B, which was 61%.

The findings of the two new studies provide "more converging evidence that blood type may play a role in a person's susceptibility to Covid infection and their chance of having a severe bout of Covid-19," said Dr. Amesh Adalja, senior scholar at the Johns Hopkins University Center for Health Security in Baltimore, who was not involved in either of the studies.

A separate study, published in The New England Journal of Medicine in June, found genetic data in some Covid-19 patients and healthy people suggesting that those with Type A blood had a higher risk of becoming infected, and those with type O blood were at a lower risk.

For instance, research suggests that people with blood type O appear to be more susceptible to norovirus infection.

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