Vaccines against Covid: protection drops sharply after six months, according to a British study

London, England | A British study on Wednesday suggests that protection against coronavirus conferred by the Pfizer/BioNtech and Oxford/AstraZeneca vaccines drops significantly after six months, according to the authors of the recall campaigns.

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One month after receiving the second dose, the Pfizer vaccine can prevent 88% of contamination with COVID-19, but that protection drops to 74% after five to six months, according to a recent Zoe Covid study analysis.

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For the AstraZeneca vaccine, efficacy drops from 77% one month after receiving the second dose to 67% after four to five months, says the study, which was conducted using data collected from nearly one million users of the Zoe app, which was set up by a private group. of the same name, and researchers at King’s College London and Zoe’s team analyzed it.

The latter analyzed contaminations that occurred between May 26 and July 31, 2021 in people who downloaded the app between December 8, 2020 and July 3, 2021 after vaccination.

The British vaccination campaign, which currently gave a second dose to 77% of those over 16 years of age, targeted the elderly and those considered vulnerable as well as health care workers. Thus, these groups, according to King’s College researchers, are those groups in which protection has diminished the most.

“In a plausible disaster scenario, we could see less than 50% protection for seniors and health workers by winter,” said Professor Tim Spector, the scientist who leads the project.

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If this number relates to contaminants and not acute forms, this could translate into an “increase in hospitalizations and deaths” if the country is exposed to high levels of pollution and a highly contagious variant.

That is why the researcher considers it “necessary to plan to increase the vaccine”, which also means thinking about the importance of vaccinating minors “according to the sources of the vaccine”.

This recall issue is now being considered by several countries, including the UK which intends to introduce a new dose to the most vulnerable from September despite the reluctance of the World Health Organization (WHO) wanting to prioritize vaccinating the poorest countries.

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