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The Pandemic of Covid-19 provided more than one year new news, but the release of safe and efficient vaccines provided at least one luminous spot in the fight against the virus. But because of the very nature of how vaccines work, health experts began to question the duration of the initial doses would protect people from the infection and how a emergencypotential reminder shot could be. The most recent overview of the question comes from a new important study that has examined the quality of qualityRecipients of the anti-Pfizer vaccine Have been protected from five months after getting their shots, find that there was a change over time.

RELATED:Pfizer has just said that "strongly" reinforces the protection of the delta variant.

Researchers working with the Zoe Covid Study application of U.K.'s Zoe Covid analyzed data of more than 400,000 people who received the Pfizer vaccine to check for time. The results showed that the shots provided 88% effective against the virus one month after the second dose before falling into74% five or six months after The blows had been administered.

The study team indicated that the researchers collected all the data after May 26, which is when the Delta variant became the dominant strain in the United Kingdom, they also concluded that the reduction of efficiency In time could eventually explain the recent increase in breakthrough infections. people. However, they also pointed out that the results did not mean that the blows themselves are not worth it to be obtained.

"Protection against the decrease is to be expected and is not a reason not to be vaccinated"TIM SPECTOR, MB, Senior Investigator on the Zoe Covid Study Application, said when presenting the results at a webinar on August 24. "Vaccines always offer high levels of protection of the majority of the population, particularly against the delta variant, so we still need as many people as possible to be fully vaccinated."

RELATED:If you have this vaccine, you can be more protected against Delta.

The spectorate also felt that the effectiveness of vaccination could fall as low as 50% in winter and that the results highlight the need for boosters in part of the population, the BBC reports. Always another expert involved in research stressed that conclusions line up what could beexpected shots over time.

"So we knew there would be some stabilization, and the way I look at it is that the leveling is actually a little slower than what I would have expected:"Alexander Hammers, MD, Professor of Imaging and Neuroscience at King's College London, said at the webinar, who added that people were "always probably at least 50% protect" despite a "link" in efficiency over the time. "Remember that when vaccines have been developed, it was hoped that they were to have an efficiency of 60 to 70% and that everyone has been pleasantly surprised to have come much more than 80%, sometimes well More than 90 years, "he said.

Other recent research found that Covid vaccines lose their effectiveness over time. In a study published by disease control and prevention centers (CDC) on 18 August,Residents of 3,862 retirement homes were analyzed from March 1st to May 9th, whereas Apha was the dominant variant. Later, about 15,254 nursing homes were analyzed from June 21st to August 1, when the Delta variant had resumed. Although the study did not measure the protection against serious illnesses, the results revealed that the efficacy rates against CVIV-19 infections have dropped from 75 to 53%. The authors of the study concluded that "additional doses of Vaccine Covid-19 could be considered for the residents of the nursing home and long-term care centers".

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Similarly, the authors of the Zoe Covid study application on the application also stressed that all members of the population will not require a reminder to the immunity of COVID-19. "Many people can not need them. Many people may have had a natural booster because they have already had a natural covidation infection, then there will actually be three vaccines," said Spector. "So, I think the whole thing must be managed much more carefully than simply give it to everyone, which would be a huge waste and ethically doubtful given the resources we have. I think we need a approach more targeted than last time. "

RELATED:If you did this before your vaccine against Pfizer, you may be more protected.