Health
COVID-19 vaccine is 66% effective against delta mutants
August 25, 2021- vaccination When the Delta mutant became the predominant strain in the United States, its efficacy against COVID-19 infection decreased from approximately 91% to 66%. New research Published on Tuesday by the CDC.
Decline shows the highly contagious nature of Delta variant And it emphasizes the importance of vaccination to prevent severe illness, hospitalization, and death, the study authors wrote.
“Although there was a decrease in the protection of COVID-19, vaccination For Delta variants, it’s still a two-thirds reduction in risk, “said Ashley Fowlkes, epidemiologist and lead author of the CDC’s COVID-19 emergency response, ScD. Told to CNN..
The latest update is part of a study tracking health workers, first responders, and other essential workers that are tested weekly in eight locations in six states. Weekly tests, according to CNN reports, help researchers more accurately track the proportion of people who are mild or asymptomatic and who are unlikely to be tested overall.
Of the 4,217 participants, 3,483 (83%) were vaccinated. About 65% received the Pfizer vaccine, 33% received the Modana dose, and 2% received the Johnson & Johnson Shot. Between December 2020 and April 2021, the vaccine was about 90% effective in preventing infection with or without symptoms.
Between April and August, the Delta variant became more predominant and the vaccine began to become less effective, but there was still very little infection. Researchers found 19 infections among 488 unvaccinated people, and about 95% had symptoms. In addition, 24 infections were found among 2,352 fully vaccinated individuals, with 75% having symptoms. This study did not include details about the type or severity of symptoms.
“It’s still a very powerful vaccine,” Fowlkes told CNN. “But we also aim to keep using the mask for a little longer.”
CNN reports that the research team is planning a future analysis comparing the various COVID-19 vaccines with the types of symptoms in vaccinated and unvaccinated individuals.
On Wednesday, Johnson & Johnson reported that a second dose of the vaccine would increase antibody levels against. coronavirus..When participants received booster shots at 6 months, their spike-binding antibodies were about 9-fold higher than after the first dose, the company wrote. In the statement..
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