Coronavirus Vaccines Show Decreased Efficacy Against Delta Type

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Coronavirus Vaccines Show Decreased Efficacy Against Delta Type

In a study conducted by Oxford University in the UK, it was revealed that the effectiveness of vaccines against the Delta variant of coronavirus is reduced within 3 months.

According to reports, an Oxford University study comparing the effectiveness of vaccines against the Delta variant discovered that two commonly used vaccines in the UK had reduced effect.

The study, based on an analysis of more than 3 million nasal and throat swab test samples, found that the efficacy of Pfizer/BioNtech’s mRNA vaccine and AstraZeneca against the new strain decreased after 90 days.

Furthermore, research has shown that people who use the Pfizer or AstraZeneca vaccine are more likely to be infected with the Delta variant than any other strain of the virus.

Two weeks after the second dose, the efficacy of the Pfizer vaccine was 85% and that of the AstraZeneca 68%, and after 90 days this efficacy decreased to 75% (Pfizer) and 61% (AstraZeneca).

The decrease was more pronounced in people aged 35 years and over.

Sarah Walker, a professor at Oxford University, said two doses of both vaccines worked well against Delta.

The researchers did not say how much the vaccine protection would be reduced over time but indicated that more work would be done.

Research has shown that adults who complete the vaccination have the same amount of virus germs as those who are unvaccinated when they are infected with the Delta variant.

The researchers said that the high viral load suggests that achieving collective immunity against the virus in a large population would be a major challenge.

Collective immunity means that a large portion of the population is protected from disease through vaccination which stops the growth of new cases.

They say that vaccines may be the best way to prevent the spread of the disease.

“The accumulation of the virus in the throat is just one aspect of the increase in the severity of symptoms and there is no new data on the duration of the disease,” she said. 

The results of this study have not yet been published in any medical journal, but the findings suggest that the Delta type may make more people who complete the vaccination sick than other types of the virus.

According to researchers, this is due to the analysis of data before and after the spreading of Delta.

Researchers compared more than 2.8 million swab tests of more than 380,000 people between December 1, 2020, and May 16, 2021 (the period when the Delta did not begin to spread in the UK). This result was obtained from 810,000 individual tests. 

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