Third dose of Pfizer vaccine 'probably' needed

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People who have received the Pfizer vaccine will "probably" need a third dose within six months to a year, then probably an injection each year, said the boss of the American pharmaceutical giant.

A plausible assumption is that a third dose will likely be needed, between 6 and 12 months. And from there there will be a vaccination again every year, but all this has to be confirmed, said Albert Bourla, CEO of Pfizer, in statements released Thursday by CNBC.

And on the other hand, variants will play a key role, he added.

It is extremely important to minimize the number of people vulnerable to the virus, continued Mr. Bourla.

Earlier today, the director of the anti-COVID cell of the Biden administration also assured that Americans should expect to receive a vaccine booster in order to protect them against circulating coronavirus variants.

We don't know everything at this point, admitted Dr. David Kessler, during a hearing before the American parliamentarians.

We study the duration of the antibody response, he clarified. It looks strong, but it is experiencing some decline and the variants are a challenge.

For logistical reasons, and only for logistical reasons, I think we should consider that there may be a recall, Kessler said.

The Pfizer-BioNTech alliance had already announced in February to study the effects of a third dose of its vaccine against variants in a clinical study.

Administered in two doses, this vaccine uses, like Moderna's, innovative messenger RNA technology, which had never before been used in real life.

At this stage, these two vaccines are the best performing with an effectiveness of 95% for that of Pfizer-BioNTech and 94.1% for Moderna against COVID-19, according to clinical studies.

Read also :

  • Efficacy, duration, transmission: update on COVID-19 vaccines
  • Pfizer-BioNTech says its vaccine is 100% effective in 12 to 15 year olds
  • COVID-19: the first dose of vaccine effective enough to delay the second


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