Several studies have shown that people with blood type O are less likely to be infected with Covid-19. Would you be more immune? How do you explain these results? Answers from researchers to date.
[Mis à jour le mercredi 28 octobre à 10h51] It has already been known that advanced age, diabetes, or primary respiratory or cardiovascular disease may increase the risk of developing severe form of coronavirus infection. Blood type can also be a risk factor for Covid-19. In any case, this is what several scientific studies report. What we know to this day.
► In March 2020, first statistical study * published on the MedRksiv pre-publishing scientific site and conducted by Chinese researchers at Shenzhen University, showed that:
- People in group O would have 33% less risk of being contaminated with the new coronavirus compared to people in groups B and AB.
- People in group A would have increased risk of 20% be contaminated with the new coronavirus compared to people in groups B and AB.
- These two hypotheses seem to be valid, regardless of the gender or age of the person being studied.
. Second study, published June 17, 2020 in Journal of Medicine in New England conducted on 1,980 individuals with Covid-19, achieved the same results: higher risk of Covid-19 infection in blood group A compared to other blood groups and protective effect in blood group O. compared to other blood groups.
“The relationship between blood type and the risk of contracting the virus has now been determined “
“There were in all eight previous prints on this topic. To my knowledge, six have now been published in major scientific journals“, points out Jacques le Pendou, immunologist and director of research at Inserm, during an interview with Mariana.For me, the relationship between blood type and the risk of contracting the virus has now been determined. If the causal link has not yet been established, all of these studies add up to the fact that O blood groups are less at risk than others.”
Ва Two new scientific studies whose results were published Oct. 14 in the American Society of Hematology’s Blood Advances magazine detail the link between blood type and the severity of coronavirus infection.
→ The first study of 473,000 people who tested positive for Covid-19 found that Danish patients with COVID-19 with type O or B blood spent less time in the intensive care unit than their type A or AB counterparts. They needed less mechanical breathing and dialysis because they suffered less kidney failure.
A second study of 95 patients severely affected by Covid-19 at a hospital in Vancouver, Canada, between February and April 2020, also found that patients with type O or B blood passed an average of 4.5 days less in the intensive care unit than those with type A or AB blood who spent an average of 13.5 days in the intensive care unit.
How to explain this connection between Covid-19 and blood type?
Depending on our blood type, our blood develops different antibodies.
“This [résultat] no wonder. We found the same thing during a 2003 study of the SARS virus epidemic (coronavirus very close to Covid-19, editor’s note)“Pointed out quesak Le Pendu, this time for France Inter. In 2008, a French study published in Glycobiology involving quesak Le Pendu beginning of explanation. Depending on our blood type, our blood develops different antibodies. The plasma that makes up the blood contains anti-A and anti-B antibodies in humans in group O, all pH together, which would represent potential dual virus defense, such as Covid-19 for example. In contrast, human plasma in group A contains only one type of antibody (anti-B), which is the only potential defense against the virus.
Warning about these results …
Of course, the results of these four studies should be taken with a grain of salt. In other words, not all people in group A will necessarily be infected with the coronavirus. Conversely, people in group O are not immune to Covid-19 either. “There is only a small rate of protection or risk of infection, which clearly indicates that several other factors are involved in this disease. Further research is therefore needed to establish this relationship.“, Comments Dr. Saktivel Vayayapuri, Associate Professor of Pharmacology-
How do you know your blood type?
A blood test, prescribed by your doctor, is the easiest and most common way to detect your blood type. After your appointment at a laboratory or medical center, you will be given a blood type card stating whether you are A, B, AB or O and Rhesus (+ or -). Note that you can also know your blood type when donating blood.
What is the rarest blood type? Most often?
|Blood type||Percentage globally|
– Relationship between blood group ABO and susceptibility to KOVID-19, Medrsiv, 16 mattresses 2020. To achieve this result, the research team analyzed the health status and blood type of 2,173 people infected with Covid-19 from three hospitals in Wuhan and Shenzhen, of which 206 died from infection with the new coronavirus. They then compared them with the health and blood type of 3,694 Wuhan residents who were not contaminated with the coronavirus.
Inhibition of the interaction between SARS-CoV Spike protein and its cell receptor by antibodies against histo-blood group, Patrice Guillaume, December 2008, Glycobiology.
– Reduced prevalence of SARS-KOV-2 infection in ABO blood group O, October 14, 2020, blood advances.