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Three doses would be needed for the Pfizer vaccine

The US laboratory said last week that people who have been vaccinated with its serum should “probably” have boosters within six months to a year. In question, the variants.

The US laboratory said last week that people who have been vaccinated with its serum should “probably” have boosters within six months to a year. In question, the variants.

(AFP) – Two doses of the Pfizer vaccine will “probably” not be enough to be fully immunized. If this hypothesis “must still be confirmed”, the CEO of the American laboratory Albert Bourla affirmed last week that a third dose would be “probably necessary, between six months and twelve months”. The CEO also indicated that people vaccinated with his serum will also have to do a booster “every year”. This is the case for other vaccines such as influenza.

Like the CEO of Pfizer, the director of the anti-Covid cell of the Biden administration points to the variants. During a hearing before the US parliament, Dr David Kessler said that while “the duration of antibody response” seemed “strong”, variants remained “a challenge”. These can in fact resist the immune effects of vaccines. “It is extremely important to minimize the number of people vulnerable to the virus,” Dr. Kessler recalled.

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.

As a reminder, Luxembourg expects 675,290 doses of this vaccine by the end of June. The goal: to speed up the vaccination campaign. According to the latest figures from the Ministry of Health, 46,256 people received the two vaccine doses in the Grand Duchy.


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