An additional dose of the COVID-19 vaccine provides more than 90% protection against symptomatic disease in adults over 50 years of age.
This was revealed in a medical study conducted in the United Kingdom.
The UK Health Security Agency’s study found that two weeks after using the booster dose of the Pfizer vaccine, those who had been given the first AstraZeneca vaccine had a 93.1% protection against symptomatic disease.
Similarly, the efficacy of booster dose was found to be 94% in those who used 2 doses of Pfizer vaccine.
It should be noted that various medical research reports have found that the effectiveness of 2 doses of vaccine against symptomatic disease decreases over time.
Dr Marie Ramsey, head of immunization at the UK Health Security Agency, said the results of the study showed that booster doses could provide protection against symptomatic disease in people at serious risk of COVID-19.
“We know that protection from the first two doses of the vaccine in the elderly is declining over time, which is why millions of people need extra protection as winter approaches,” he said.
That’s why people should come forward for booster doses to prevent hospital admissions and mortality during the winter, he said.
The results of this study have not yet been published in any medical journal but have been published on the British Government’s website.
An earlier study in early November 2021 found that a third dose of the Pfizer vaccine significantly reduced the risk of hospitalization and death from the disease.
The study, conducted by Harvard University in the United States and Clalit Research Institute in Israel, examined the effectiveness of vaccine supplementation nationwide.
About 7.5 million people in Israel were given a booster dose of the Pfizer vaccine.
Examination of these data for research showed that an additional dose of the vaccine significantly reduced the risk associated with codeine compared to 2 doses.
Research has shown that this extra dose reduces the risk of hospitalization by 93%, the risk of serious illness by 92% and the risk of death due to cod by 81%.
According to research, the protection from booster doses is very strong but the risk of the disease is not very high even in people who use 2 doses of vaccine.
The researchers said that the results show that the third dose of the vaccine is very effective against serious complications of COVID.
The results of the study were published in the medical journal The Lancet.