COVID-19: Singapore confirms nine new cases, eight of them imported

“He had no previous history of hearing loss or ear pathology,” they noted

A growing body of research shows that blood type can play an important role in infection with the deadly coronavirus.

They also controlled for ethnicity, as blood group distributions differ among ethnic groups, and maintained that fewer people with blood type O tested positive for Covid-19.

The first of the two studies saw scientists look at health registry data from more than 473,000 people in Denmark who tested for Covid-19 and compared it to a control group of more than 2.2 million people from the general population, accounting for nearly 40 percent of the total Danish population.

This lends credence to the fact that people with blood type A, B and AB, may be more at risk of getting infected than those with blood type O.

Between the blood types A, B and AB, no significant difference in rates of infection was found.

A retrospective study of individuals tested for coronavirus showed that blood type O "may offer some protection against COVID-19 infection".

Types A and AB were also more likely to need a type of dialysis that helps the kidneys filter blood without too much pressure on the heart. An April study, too, (though it has yet to be peer-reviewed) found that among 1,559 coronavirus patients in New York City, a lower proportion than would be expected had Type O blood.

According to the American Red Cross, O-positive is the most common type of blood across all races.


The interesting observation made in this study was that the patients with the blood group A and AB required more of the mechanical ventilation, as compared to the blood group O. Similar was the case with patients being admitted in the ICU.

Lead author of the study, Dr Mypinder Sekhon, of the University of British Columbia, said: "The unique part of our study is our focus on the severity effect of blood type on COVID-19".

That's lower than the prevalence of Type O in a population of 2.2 million Danish people, 41.7 percent, so the researchers determined that people with Type O blood had disproportionately avoided infection.

Past research has also suggested that people with Type O blood were less susceptible to SARS, which shares 80 percent of its genetic code with the new coronavirus.

However, in both studies, the scientists said more research was needed.

"But at the present time, there is no reason to think that if you have type O blood, you're protected from COVID-19".

The trends remained unaffected after the researchers factored in ethnicity, which affects blood group distributions.

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