THE QUESTION.
While the Covid-19 vaccine booster campaign has just been opened to all people 18 years of age and over, some are wondering about the nature of this third dose.
Have the composition and dose of active ingredient in the vaccine been changed?
The question is legitimate, since we know that the Delta variant - the majority in Europe - is more contagious than the initial virus.
However, the vaccines developed from this original virus would be a little less effective against Delta.
What is it?
Have manufacturers adapted their vaccine to the Delta variant?
Read the Covid-19 file: all you need to know about the coronavirus pandemic in France and around the world
CHECKS.
Let us first remember that vaccination consists of injecting into the body a fragment of the virus against which we want to develop immune defenses.
In this case, vaccines against Sars-CoV-2 make it possible to present to the immune system the protein which serves as the entry key for the virus to infect human cells: the spicules, called "spikes" in English, which line its area.
But this protein is not fixed.
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