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Protection against
Covid-19
infections
in people who are fully vaccinated with
AstraZeneca
and
Pfizer
preparations
begins to decline within about six months, according to the findings of a study released Wednesday.
The results released today by experts in charge of the
Zoe Covid
investigation
revealed that the protection of the vaccine developed by Pfizer / BioNTech, which protected
88%
against the virus one month after the second dose was administered, decreased to
74%
between 5 and 6 months after the second injection.
In the case of the one developed by AstraZeneca, which offered
77%
protection against coronavirus infection one month after the second dose, the scientists saw that after four to five months of the vaccine that protection decreased to
67%
.
The study was carried out using Covid PCR test results that were positive, carried out between the last months of May and July among more than a
million people
in the
United Kingdom
who already had the complete immunization schedule.
In addition, the experts pointed out that in the worst case the protection provided by these vaccines against the virus could begin to decline to below 50% in the elderly and health workers for the winter.
Tim Spector,
the principal investigator of the Zoe Covid application, behind this analysis, believes that these results would explain the cases of infection registered in people with the full vaccination schedule.
"We should expect a decrease in protection (from vaccines) but this is not a reason for people not to get vaccinated," Spector said.
He also recalled that vaccines "continue to provide high levels of protection for the majority of the population, especially against the Delta variant, with which we continue to need to fully vaccinate as many people as possible."
The UK could start
offering a third
coronavirus
booster shot
next month to some people, although it has yet to get a recommendation from the independent body
JCVI,
which assesses that possibility.
However, Spector told the
BBC
that "many people may not need it" and considered that this matter needs to be "handled more carefully".
According to the criteria of The Trust Project
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