A, B, and AB individuals are also at increased risk for thrombosis and cardiovascular diseases, which are important comorbidities among hospitalised Covid-19 patients, possibly mediated by glycosylation of proteins involved in haemostasis.
However, in both the studies scientists said that more research was required.
However, even though among a group of 2.2 million people who were not tested for Covid-19, the blood type made up 41.7 percent of the population. Recent studies have found that people with blood group O have a low risk of catching the coronavirus.
Blood groups A and AB associated with increased risk of severe clinical outcomes of COVID-19 infection People with blood groups A or AB appear to exhibit greater COVID-19 disease severity than people with blood groups O or B, according to a separate retrospective study.
This measurement, called the Dublin-Boston score, is created to enable clinicians to make more accurate decisions in determining patients who can benefit from treatment methods such as steroids and to be taken into intensive care.
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.
Distribution of blood groups was compared with data from non-tested individuals. However, they did find that only 61% of the patients with Type O or B blood needed a ventilator, compared to the patients with Type A or AB i.e. 84% while, they were also more prone to need dialysis, which means these patients have more risk of organ failure.
Previous studies have indicated similar results in patients with blood type O. They align with the findings of a third study published in June in the New England Journal of Medicine that looked at genetic data to determine that those with type A blood were at a higher COVID-19 risk and those with type O.
Recent reports have suggested that ABO blood groups might play a role in the infection, with a lower than expected prevalence of blood group O individuals among patients.
Advice is still to wash your hands and follow the guidelines issued by authorities - whatever your blood type.
Research is correlating the idea that people with blood group O are on a little advantage during this pandemic. Although blood group frequencies and susceptibility for SARS-CoV-2 can vary substantially among ethnic groups, Denmark is a relatively ethnically homogenous society with free access to health care services.