The measurement, called the Dublin-Boston score, is created to enable clinicians to make more informed decisions when identifying patients who may benefit from therapies, such as steroids, and admission to intensive care units.
In March, research of more than 2,100 Covid-19 infected patients in Wuhan and Shenzhen also found that people with O blood group have a lesser risk of infection.
Meanwhile, others may have suffered permanent organ damage.
"Of particular importance as we continue to traverse the pandemic, we now have a wide range of survivors who are exiting the acute part of Covid-19, but we need to explore mechanisms by which to risk stratify those with longer-term effects". A study published in July looking at patients in five major hospitals in the state of MA found that people with blood type O were less likely to test positive for COVID-19 than those with other blood types. In an a lot bigger information sample of over 2.2 million individuals in Denmark who were not tested for the virus, 42% had Type O blood and 42% had Type A blood. The papers, published in the journal Blood Advances, add to evidence of a link.
The study results suggest that people with blood types "A", "B", or "AB" may be more likely to be infected with Covid-19 than people with type "O".
There was a slight, but statistically significant, difference in blood group distribution between the SARS-CoV-2- individuals and the reference population. These outcomes appear to show that notwithstanding people with Type O and Type A blood being equitably part among everyone, Type O is less powerless against the virus.
"The Dublin-Boston Score is effectively determined and can be applied to all hospitalized Covid-19 patients", said Gerry McElvaney, RCSI Professor of Medicine, the lead inventor of the study and specialist at Beaumont Hospital.
Earlier researches have also suggested that people with O blood group were less vulnerable to SARS. Patients with type A or AB blood were more likely to require mechanical ventilation, suggesting that they had greater rates of lung injury from COVID-19. I don't think this supersedes other risk factors of severity like age and co-morbities and so forth.
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.
There are four main blood groups - defined by their numbers of antigen and antibody proteins.