Vaccines AstraZeneca and Pfizer they showed a lower efficiency protection against the Delta variant of Covid-19.
However, the AstraZeneca vaccine remains more effective against this variant of concern than lower efficacy shown for the Pfizer vaccine.
This was revealed by a new british study which revealed that the Pfizer vaccine loses efficacy faster than AstraZeneca against this variant that leads new waves of contagion worldwide.
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AstraZeneca and Pfizer Vs. the Delta variant
Despite a reduction in efficacy shown for vaccines AstraZeneca and Pfizer, the specialists who conducted the study assured that both doses are still very effective against Covid-19.
A group of researchers from the Oxford University analyzed samples from 700,000 people who were vaccinated between December 2020 and August 2021, with both doses.
Koen Pouwels, one of the researchers who participated in the study, confirmed that the results showed a “setback” in the effectiveness of both vaccines, although to a greater extent at Pfizer.
The researcher added that for AstraZeneca the differences registered between one month and another were minimal, that is, “there may be no change in protection“.
The results
The study shows that one month after a person received the second dose of Pfizer maintains 90% protection against the Delta variant.
However, eProtection spectrum drops to 85% two months later and up to 78% three months after the second dose of Pfizer.
The study confirmed that after four to five months, Pfizer’s effectiveness against Delta variant is practically the same as AstraZeneca after two weeks of second dose.
The Pfizer vaccine obtained on August 23 the full FDA approval, making it the first vaccine against Covid-19 to leave the category of emergency use in the United States.
AstraZeneca maintains your protection
Although the AstraZeneca vaccine has a lower initial efficacy compared to Pfizer, its protection against the Delta variant is maintained over the months.
Behind the second dose the vaccine shows a 67% effective, this percentage falls to 65% after two months and to 61% three months later.
According to Pouwels, despite “the slight drop in the level of protection (…) the overall efficacy (of the two vaccines) remains very high”.
Main conclusions of the study:
- Have the full scheme vaccination of Pfizer and AstraZeneca it is still the most effective way to ensure protection against the Delta variant.
- AstraZeneca and Pfizer vaccines continue to offer good protection against new infections for the Delta variant.
- Two doses of either vaccine continue to provide at least the same level of protection as infection and recovery from Covid-19.
- People who had been vaccinated after have already been infected with Covid-19 they had even more protection than vaccinated individuals who had not become ill.
The Delta variant (B.1.617.2), which originated in India and already has a presence in more than 100 countries, has grown rapidly in Mexico.
The first case was registered in the country on April 21 of this year.
(With information from AFP)
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