Asked Monday about the possibility of a third injection of the Pfizer vaccine to be immunized against Covid-19, Doctor Jimmy Mohamed, health consultant of Europe 1, estimated that it would depend on possible new mutations of the virus.

According to him, the elderly or immunocompromised could be the main affected by this additional dose.

A first dose of vaccine against Covid-19, then a second and, finally, the end of the tunnel? Not necessarily. The boss of Pfizer announced that people who received the vaccine developed by his laboratory against Covid-19 would "probably" need a third dose within six months to a year. "A plausible assumption is that a third dose will probably be needed, between six months and twelve months, and from there there will be one vaccination again every year, but all of this needs to be confirmed," said Albert Bourla, the CEO of Pfizer, according to statements made public on April 15 by the American channel CNBC. Asked Monday on this hypothesis by an auditor freshly vaccinated with Pfizer, Doctor Jimmy Mohamed, health consultant of Europe 1,calls for caution and not to project so far back in time, when it is still so difficult to predict the evolution of the epidemic from one month to another.

The question of Brigitte, from Bordeaux:

"I received a first injection of the Pfizer vaccine. The second is scheduled for the end of April. Do I have to give a third injection?"

Jimmy Mohamed's response:

"This is a question that I am asked every day in the vaccination center, but for the moment we do not know anything. Each day is enough its trouble. We are unable to predict the evolution of the virus d 'within a month or two, and therefore even less to know what we will have to do next fall.

We can imagine that over time, we will gradually lose the protection conferred by vaccination and that it will certainly be necessary, in the fall or next winter, to give a booster shot.

Especially when we know that some people a little more fragile, a little old, a little immunocompromised, may have a poorer vaccine response.

They will therefore most likely need another dose.

But let's first focus on the first two doses, which will allow us to fight the epidemic as we are currently experiencing it. 

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 Coronavirus: follow the evolution of the situation Monday April 26

Can we consider an annual vaccination against Covid-19, like that against the flu?

This is one of the hypotheses. Why is the flu vaccinated every year? Because we are gradually losing our immunity. But on top of that, the flu virus mutates. This is a phenomenon referred to as selection pressure. This means, when a large percentage of the population is vaccinated, that the virus can mutate to escape immunity, and therefore disappearance. This is what happened in some countries like Brazil, when a major part of the population had contracted the coronavirus, especially in Manaus. The coronavirus has been able to adapt and create variants. It is therefore possible that each year we have to be vaccinated again with a small booster.

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Find all of Sans rendez-vous every day from 3 p.m. to 4 p.m. on Europe 1 as well as in replay and podcast here

We are talking about the vaccine produced by Pfizer, but should we also consider the same for other products, such as Moderna?

If a third dose is needed for the Pfizer, it's a safe bet that you will have to proceed in the same way with the other vaccines. "