Two studies suggest blood type O at less coronavirus risk


According to two medical studies published Wednesday, people with blood type O may be at lower risk of contracting the coronavirus disease (COVID-19). However, the reasons for this are not yet clear, and experts suggest further research is needed.


Blood O reduced susceptibility

A Danish study, conducted by 11 researchers based on information of 473,654 individuals tested for COVID-19, found that blood group O was associated with a decreased risk of coronavirus infection.

“We demonstrate that blood group O is significantly associated with reduced susceptibility to SARS-CoV-2 infection,” said the study published Wednesday on Blood Advances, a peer-reviewed medical journal of the American Society of Hematology.

The research indicated that individuals with blood types A, B, and AB were also at higher risk of exhibiting thrombosis—the clotting of blood inside a blood vessel—and cardiovascular diseases, which are significant co-occurring conditions among hospitalized COVID-19 patients.

Similar results were found by a Canadian medical study conducted by 14 researchers based on data collected from intensive care unit patients in six metropolitan Vancouver hospitals.

“COVID-19 patients with blood group A or AB appear to exhibit a greater disease severity than patients with blood group O or B,” found the study, which was published in the same journal. Likewise, adding that individuals with blood group O were reported to be “less susceptible to SARS-CoV-2 infection.”

The study also noted that Covid-19 patients of blood group A or AB had a higher risk of requiring mechanical ventilation and longer duration in intensive care, compared to those with blood group O or B.

While 84 percent of patients with blood groups A or AB required mechanical ventilation in SARS-CoV-2 infection, that level was 61 percent for patients with blood types O or B, according to the research.

The median length of staying in intensive care units was 13.5 days for patients with A or AB blood types, while it was only nine days for patients with O or B blood types, the study found.


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As of Friday, the number of COVID-19 cases in the world stood around 38.8 million and deaths close to 1.1 million on Thursday, according to Johns Hopkins University data.

—(Source: PNA)