Health
Studies: COVID-19 vaccine shows reduced defense against delta mutants
Staten Island, New York — In a large study conducted by Oxford researchers in the United Kingdom, the coronavirus (COVID-19) vaccine was vaccinated with a weak defense against toxic delta variants and experienced a breakthrough infection. It has been identified that people may still be at risk of infection for unvaccinated individuals.
The study analyzed a dataset of more than 2.5 million PCR tests involving approximately 385,000 British adults from December 1, 2020 to May 16, 2021. This was before the delta variant became widespread, from May 17, 2021 to August 21, 2021 — when Delta was dominant.
Survey results published in Preprint This month, we analyzed the strength of the Pfizer-BioNTech and AstraZeneca vaccines and found that infection prevention was effective from 85% and 68% two weeks after the second jab to 75 90 days after the second injection, respectively. We found that it dropped to% and 61%.
This decrease was more pronounced among people over the age of 35. They are more likely to have been given early in the development of the vaccine compared to younger individuals. On the other hand, people with previous infections who received two doses had the best protection against future infections.
Professor of Medical Statistics at Oxford University, the survey said Reuters..
In line with a study by the National Center for Disease Control and Prevention (CDC), Oxford analysis found that unvaccinated individuals could become infected and infect the disease due to the infectivity of delta variants. Individuals who have found that vaccinated people can carry as much virus as unvaccinated.
“In Delta, infections that occurred after two vaccinations showed peak viral load similar to that of unvaccinated individuals,” the study said. “SARS-CoV-2 vaccination still reduces new infections, but peak viral load efficacy and attenuation is reduced by delta.”
The study does not show how likely vaccinated people are to spread the virus compared to unvaccinated people, but high viral load levels are an important indicator of infection. is.
The study did not test the effect of vaccination on hospitalization.But Staten Island health officials The majority of inpatients and death from COVID-19 In the autonomous region, it was in the unvaccinated population.
Immunity weakness occurs when federal health authorities develop plans to provide booster immunity to growing groups in the coming months.
New York State and City Health Authority Already Approval and recommendation A third dose for people with weakened immunity, eligible residents can receive a third dose 28 days after the second dose.
Booster doses will be available to all Americans starting September 20th. Federal health officials announced Wednesday. Advance / SILive.com previously reported.
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