Since the start of the epidemic, scientists have been studying the link between blood group and Covid-19 contamination. A Chinese preliminary study carried out last March already suggested that people with blood type O were less likely to be infected with Covid-19.
“All studies converge”
Since, several studies seem to confirm this thesis. ” All studies converge, people with blood group O are less likely to get coronavirus infection », Underlines France Pirenne, medical director of the French Blood Establishment (EFS) in Île-de-France at Parisian.
INSERM and the University of Nantes, under the direction of the immunologist Jacques the Hanged Man, indicate in the review Viruses qu’« a general consensus has emerged that blood type O appears to be associated with a lower risk of Covid-19 “. This risk would be between 10 and 33% less important for people in group O.
A Spanish study presented at the congress of l’American society for reproductive medicine even specifies that it is the O + which seem the most preserved. Dr André Guérin, head of the French-speaking department ofIVI specifies that : ” among the data analyzed in our population during the post-containment period between May and June, on a sample of 6,140 people for SARS-CoV-2, we found that the incidence of the disease was lower in the patients of the group O. »
How to explain it?
This observation can be explained in particular by antibodies produced naturally by people with blood group O who ” may be partially protective against SARS-CoV-2 virions carrying blood group antigens from non-O individuals “, Say Nantes researchers.
Another advantage for people in group O, their blood clots less, so they are less exposed to the risk of thrombosis (blood clot) and vascular dysfunctions which are part of the complications of Covid-19, making their case potentially less at risk.
But be careful not to let your guard down. People in group O seem to be better equipped to deal with the virus, but they are not immune and must continue to respect barrier gestures. Especially since these studies do not take into account the variants, which appeared later.
“The O’s contaminate each other”
The blood groups O have natural anti-A and anti-B antibodies, while A have only anti-B and vice versa. But if one individual from group O infects another, then the virus may well enter. Which may explain the explosion of cases in Manaus, Brazil, ” where the vast majority of the population was from group O, the Os contaminating each other
», Jacques Le Pendu explained to Parisian. In France, it’s more balanced. There are 42% of people in group O, 44% in group A, 10% in group B and 4% in group AB according to the EFS.
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