Covid: 4th dose of vaccine increases immunity in people aged 50 to 80
According to research commissioned by the UK government and published in the scientific journal Lancet Infectious Diseases, a fourth dose of the Covid-19 vaccine further boosts immunity against infection caused by the coronavirus in people aged between 50 and 80 years. .
The study tested the Pfizer and Moderna immunizers on 160 people in the age group, and found that the booster boosted the amount of T cells by up to seven times and antibodies by 2.2 times. There were also no signs that indicate that the potency of vaccines decreases with each extra dose.
People who already had high levels of antibodies and T cells before receiving the fourth dose only had a small increase in immunity from the injection.
Despite the results, scientists still don’t know if it’s worth vaccinating younger populations with the booster, as they are already less prone to severe cases.
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Initially, only the immunocompromised population could receive the second booster dose against Covid-19 in Brazil Reproduction / Brazil Agency
In December 2021, Israel became the first country to announce the application of the fourth dose of the vaccine against Covid-19 in the world. According to the government, the reinforcement would help the nation overcome a potential wave of infections with the Ômicron variant.Brazil Agency
In early 2022, the country began offering the fourth dose of the Pfizer/BioNtech vaccine to people over 60 and healthcare professionals. Brazil Agency
According to a study carried out in Israel, the fourth injection in people over 60 years old made them three times more resistant to the coronavirus. Brazil Agency
Chile and Turkey also started the application of the second booster dose in the population over 60 years of age.Brazil Agency
European Union health ministers were instructed in January this year to prepare to distribute the fourth dose of the immunizer as soon as data show it is needed. Brazil Agency
In Brazil, a technical note from the Ministry of Health, issued in December 2021, recommended that, after four months, the dose should be applied to all immunocompromised individuals, over 18 years of age, who received three doses in the primary regimen.Brazil Agency
***Drive-thru vaccination against covid-19 at Parque da Cidade, in Brasília.
The agency also considered, in January, the possibility of applying the immunizing agent to health professionals and the elderly in all Brazilian states, however, it gave up.Brazil Agency
***Vaccination in the Umariaçu indigenous village, near Tabatinga, Amazonas.
In Volta Redonda (RJ) and Botucatu (SP), city halls increased the fourth dose for elderly people over 70 years of age, as all deaths recorded in the cities occurred in this age group. Brazil Agency
The government of São Paulo announced, in February, that it is evaluating the application of the second booster dose to the general population, after the immunization of people eligible to receive the third dose is completed.Brazil Agency
Under discussion in the federal government, a technical note from the Ministry of Health explained that, at the moment, it is not yet possible to recommend the fourth dose due to lack of data. The folder argues that it is still necessary to analyze information on hospitalizations and the relationship with the vaccinated population.Brazil Agency
Minister Marcelo Queiroga did not completely rule out the application. “In practice, it would be the 2022 dose. We have doses to guarantee all the necessary applications, recommended by technicians and that are available to the Brazilian population”, he said.Brazil Agency
“We knew it was important to offer the fourth dose to the most vulnerable at the beginning of the year. this new study shows that this decision was correct, and gives confidence to the public that the booster is safe and more effective than the third dose,” says Professor Andrew Ustianowski from the UK’s National Institute for Health and Research. The institution is one of those responsible for the survey.