Blood type may affect severity of COVID-19 infection, new study suggests

  • Blood type may affect severity of COVID-19 infection, new study suggests

Blood type may affect severity of COVID-19 infection, new study suggests

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.

Which blood types put coronavirus patients in danger?

One of the new studies specifically found that COVID-19 patients with Type O or B blood spent less time in an intensive-care unit than their counterparts with Type A or AB.

A pair of new studies suggest that those with a certain blood type may be less likely to be infected with the novel coronavirus and less likely to suffer severe illness if they were to be infected.

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

"Blood group O is significantly associated with reduced susceptibility to SARS-CoV-2 infection", the study authors wrote, meaning that people with type O blood seemed to be less likely to become infected.

However, blood types A and AB are at most risk and vulnerable to the infection.

The findings of the study are limited because blood type information was available for just 62% of those who were tested.

Both studies were published in the journal Blood Advances this week.

In July, a study looking at 1,600 patients in Spain and Italy showed slightly higher rates of severe respiratory failure in patients with blood type A compared to those with blood type O.

In the second study, the researchers examined 95 critically ill Covid-19 patients in a hospital in Vancouver. They found that patients with blood groups A or AB were more likely to need mechanical ventilation, with 84 percent of A or AB patients requiring mechanical ventilation compared to 61 percent of O or B patients.

That said, it is known that blood type can influence how your immune system fights against infections in general.

This may also signal a greater Covid-19 severity level, said the Canadian team. It's the most common blood type: About 48 percent of Americans have Type O blood, according to the Oklahoma Blood Institute.

They are also at lower risk of severe Covid-19 outcomes, such as organ failure, and even death.

There are important caveats to consider from the new research. "And if you're blood group O, you're not free to go to the pubs and bars".

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.

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