The Delta version of the coronavirus is a major concern, as laboratory studies have shown that it is more contagious և resistant to vaccines than other COVID-19 eggs.
However, there is evidence that existing tannins retain their effectiveness after two doses.
Here’s what you need to know.
A British study published in the medical journal The Lancet in early June looked at levels of neutralizing antibodies produced in vaccinated individuals exposed to the Delta, Alpha (first identified in Britain) and Beta (first found in South Africa) variants.
It found that people with two doses of Pfizer-BioNTech shot had six times lower antibody levels in the Delta version than in the original COVID-19 strain on which the vaccine was based.
Alpha և Beta versions also caused a low response: Alpha և 2.9 times fewer antibodies to Beta.
A French study by the Pasteur Institute found that neutralizing antibodies produced by the Pfizer-BioNTech hole vaccine were three to six times less effective than the Delta version than the Alpha version.
So the vaccines are still working.
Although they are an important marker, the levels of antibodies measured in the laboratory are not sufficient to determine the effectiveness of the vaccine. In particular, they do not take into account the second immune response in the form of killer T cells that attack already infected cells, rather than the virus itself.
As a result, real-world observations are important in measuring the effectiveness of vaccines, and the first results are promising.
Pfizer-BioNTech և AstraZeneca porous vaccine is just as effective in preventing hospitalization in the Delta version as it is in the Alpha version, according to data released by Public Health England on Monday.
Both doses of Pfizer-BioNTech shock prevent 96 percent of hospitalizations because of the Delta version, while the AstraZeneca vaccine prevents 92 percent, according to a study of 14,000 people.
Previous data released by the British health authorities in late May led to similar conclusions about less severe forms of the disease.
The Pfizer-BioNTech vaccine is 88% effective against symptomatic COVID-19, which occurred in the Delta version two weeks after the second dose, while the stroke is 93% more effective in the Alpha version.
AstraZeneca shows 60 percent efficiency in the case of Delta-type 66 Alpha cases, compared to 66 percent.
The Scottish authorities published such data in The Lancet on Monday.
At the same time, the team under the Sputnik V hole wrote on Twitter on Tuesday that their vaccine was “more effective against the Delta version than any other vaccine that has published results on this strain so far.” They did not publish the results, but noted that a study by the Gamaleya Center, a Russian research institute, had been published in an international peer-reviewed journal.
Is one shot enough?
Of the available vaccines, only son onson և oh john onson recommendations require one dose, not two, to be effective. There is not enough data yet to determine how this works against the Delta version.
As for other bites, laboratory tests show that a single dose of any vaccine provides only limited protection against the Delta version.
“After one dose of Pfizer-BioNTech, 79% of people had a quantitative neutralizing antibody response against the strain itself, but this dropped to 32% for B.1.617.2. [Delta]”- says the laboratory study from June.
The Pasteur Institute found that a single dose of AstraZeneca would have “little or no effect” against the Delta version.
The data of the British government confirm the tendency of real scenarios. Both vaccines were 33% effective compared to Delta’s symptomatic cases three weeks after the first dose, with about 50% effectiveness against the Alpha version.
In the UK, where the Delta version is now responsible for 96 per cent of new cases, these results prompted the government on Monday to increase the waiting period for doses for people over 40 to 12 weeks.
In France, waiting for a second dose of Pfizer-BioNTech և Moderna vaccine has been reduced from five to three weeks.
However, Pfizer-BioNTech ginger offers very high (94%) protection from hospitalization due to the Delta version after one dose.
So what is the best strategy against Delta Strain?
Scientists agree that the best protection against the Delta variant is to get two full doses of the vaccine.
Jean an-François Delphres, a senior French scholar, says the creation of a “vaccine bloc” will help prevent the Delta version from spreading to the general population.
A US study from June 10 points to the possibility of vaccines not being added to the list of options.
“Increasing the proportion of the population currently immunized with safe, effective vaccines remains a key strategy to minimize the emergence of new variants to end the COVID-19 epidemic,” it said.
Antoine Flahall, director of the World Institutes of Health, argues that it is still possible to maintain social distance, spread infectious information, and maintain restrictions when it comes to “keeping virus circulation low.”
He says that the more the virus circulates, the more likely it is to mutate and cause new mutations.