A new study at Oxfod University has revealed that vaccines are less effective against the Delta variant, and that the vaccinated are at increased risk of contracting and transmitting the virus. According to the study, the effect of the vaccine begins to wane within three months.
Despite the fact that vaccination has accelerated on a global basis in the fight against COVID-19, which has been going on for about 2 years, the alarm bells do not remain silent. On vaccines that were considered one of the most effective solutions before they were developed discussions and researches continue at a rapid pace.
The study, commissioned by Oxford University in England, found that the effect of vaccines against the Delta variant decreases rapidly and that the people who get vaccinated increased risk of contracting and transmitting viruses revealed.
Effect begins to wane within three months
In the study, in which Pfizer/BioNTech and AstraZeneca vaccines, which are the most widely used in England, were examined, it was found that although the vaccines do not lose their feature of being the best way to protect against the virus, their effects are still significant. started to decrease within three months. was recorded.
In the study, although the BioNTech vaccine offered a high level of efficacy in the first place, it had a protective effect. faster than AstraZeneca concluded.
BioNTech’s influence is dropping faster than AstraZeneca
The researchers pointed out that the immune dynamics evoked by the BioNTech and AstraZeneca vaccines after the second dose showed significant differences.Pfizer shows greater initial efficacy, but higher virus density and protective effect against symptomatic infections. falling rapidly.” says.
In the study, which used more than three million samples taken from the throat and nose across the UK, the BioNTech efficacy of 85 percent after two weeks following the administration of the second dose. to 75 percent after 90 days; In AstraZeneca, it was recorded that it decreased from 68 percent to 61 percent. It was also noted that the decrease in the level of protection was more pronounced in the group aged 35 and over.
Those who overcome the disease naturally have a stronger immunity
In the research based on the PCR tests carried out by the UK’s National Statistics Office in randomly selected houses starting from December last year, it was determined that the virus caught the virus naturally. Those who have recovered have stronger immunity than those who have been vaccinated. was also recorded.
The first phase of the study, which was conducted in two groups on more than 380 thousand people over the age of 18, started on December 1, 2020, during the period when the Alpha variant was dominant, and the second phase continued. From 16 May 2021 to 1 Augustwas carried out during the period when the Delta variant was dominant.
The virus density in the vaccinated is not less than in the unvaccinated.
Unlike when the alpha variant predominates, if people who have been vaccinated with two doses become infected with the virus virus density than those who have never been vaccinated. owner is another remarkable result of the study.
Koen Pouwels, who conducts research at Oxford University, says that the virus density seen in infected people despite being vaccinated will make it difficult to achieve herd immunity. Pouwels, “serious illness of vaccines probably the best way to prevent However, it has been shown that its effect in preventing the transmission of the virus is reduced.“It drew attention.
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Oxford researchers also stressed that the concentration of the virus in the throat of infected people roughly indicates the severity of symptoms. stated that they do not have new data on the duration of the infection.