Coronavirus risk lowered for this blood type, studies suggest

Modesto Morganelli
Ottobre 18, 2020

Around 42 percent of the Danish population has blood type O and another 42 percent have blood type A. Despite equal representation, fewer people with blood type O caught Covid-19; just 38 percent of the people who tested positive were blood type O, while 44 percent were blood type A. Similarly, people with blood type B and AB also received more positive Covid-19 results than expected.

More studies seem to indicate there is some connection between a person's severity of COVID-19 symptoms and their blood type.

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.

Scientists have been investigating a potential link between blood type and vulnerability to Covid-19 for many months, and this latest evidence supports previous findings. In the first, researchers looked at some 473,654 people in Demark who were tested for COVID-19 between February and July and compared them with the general population of roughly 2.2 million people.

A separate retrospective study showed that blood groups A and AB "appear to exhibit greater COVID-19 disease severity than people with blood groups O or B".

The team found that patients with blood groups A or AB were more likely to require mechanical ventilation, suggesting that they had greater rates of lung injury from COVID-19.

"Individuals with O blood type are between 9-18% percent less likely than individuals with other blood types to have tested positive for COVID-19, according to the data", a company statement said at the time.

Researchers of this study found that Covid-19 patients with blood groups A and AB had an increased risk of severe clinical outcomes, compared to patients with blood groups O or B.

"The Dublin-Boston score is easily calculated and can be applied to all hospitalised Covid-19 patients", said study author Gerry McElvaney from the RCSI University in Ireland.

The researchers also point out that they did not find any significant difference in rate of infection between A, B, and AB blood types.

The researchers also found more patients with blood group A and AB required dialysis for kidney failure.

It's important to emphasize that the type of reduction in risk achieved with appropriate physical distancing, wearing a mask, and hand hygiene are significantly better than depending on your blood group for protection, so people with blood type O should not be complacent about public health advice.

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