September 23, 2021

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Covid-19: Pfizer loses performance faster than AstraZeneca against delta type, says study

Researchers at the University of Oxford developed one of two series and examined samples taken from more than 700,000 participants from December 2020 to August 2021.

This analysis shows that a person who received a second dose of the Pfizer vaccine one month earlier was 90% more likely to be protected from delta variant than a person who was not vaccinated for high viral load infections. This number drops to 85% after two months and to 78% after three months.

67% of people who receive two injections of the AstraZeneca vaccine are protected after one month, 65% after two months, and 61% after three months. After four to five months, the level of protection provided by the two vaccines is similar according to the study, which has not yet been verified by peers.

These numbers “Really marks the fall” The effectiveness of the Pfizer vaccine was explained by Dr. Goen Powells, who worked on the study, while at the same time for Astrogeneka. “Differences (from month to month) are likely due to the fact that there can be no change in security”.

Nevertheless, the researcher insisted on the fact “These little drops in safety”, “Overall efficacy (of both vaccines) is very high”, Researchers emphasize that overall safety has been studied, not the level of protection from severe forms and hospitals. “Two very important data for evaluating the effectiveness of vaccines”.

The study comes as several countries, including the United Kingdom, are considering launching a booster campaign with a third dose of the vaccine.

The British government announced at the end of April that it had purchased 60 million new dose Pfizer vaccines to set up a booster program for the most vulnerable people in the fall.

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