Even though it has reached a point where 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 are not silent. On vaccines that were considered one of the most effective solutions before they were developed discussions and researches continue rapidly.

The study, commissioned by Oxford University in England, shows that the effect of vaccines against the Delta variant decreases rapidly and that people who get vaccinated increased the risk of contracting and transmitting viruses laid out.

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 in three months was saved.

In the study, although the BioNTech vaccine offered a high level of efficacy in the first place, it had a protective effect. loses faster than AstraZeneca was concluded.

BioNTech’s influence is dropping faster than AstraZeneca

The researchers pointed out that the immune amyc induced 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 is falling fast.” 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.

Immunity is stronger for those who adolescent the disease naturally

In the research based on the PCR tesdollarserine carried out by the UK National Statistics Office in randomly selected houses starting from December last year, it was determined that the virus was caught in the natural way. Immunity of those who have recovered is stronger 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 August was carried out during the predominance of the Delta variant.

The virus density in the vaccinated is not less than that in the unvaccinated.

Unlike when the alpha variant predominates, if people who have had two doses of the vaccine become infected with the virus have as much virus density as those who have never been vaccinated. has is another remarkable result from 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, ” heavy illness of vaccines probably the best way to prevent cases, but its effectiveness in preventing the transmission of the virus has decreased.” drew attention.

Oxford researchers also stressed that the density 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.

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Michael Lewis


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