Healthcare workers prepare to receive the COVID-19 vaccine on October 19, 2021 in the city of Modiin, central Israel.
Gil Cohen Meigen | Xinhua News Agency | Getty Images
Dr. Francis Collins, director of the National Institutes of Health, advises fully vaccinated Americans to take Covid booster shots to prevent breakthroughs during vacations. Pfizer When BioNTech Covid-19 vaccine against delta mutants.
Haifa’s Technion-Israel Institute of Technology team analyzed approximately 4.8 million fully vaccinated adults, of whom 13,426 were Covid-positive. Collins said the chances of a breakthrough case were “relatively rare,” but Israeli researchers said February and 3 were more likely to receive a second dose in mid-January. We found that infection rates were higher in all age groups than individuals who completed shots in the month.
“Delta mutants have certainly played a role in the resurgence of COVID-19 in recent months, but these findings suggest that weakened immunity is also an important factor,” Collins said on Tuesday. I wrote in a blog post on the website of. “Understanding these dynamics is essential for making important policy decisions.”
Israel began allowing people over the age of 60 to be vaccinated on December 20th. Researchers reported 3.3 confirmed infections per 1,000 people in that age group who received the final shot in late January. July 11th to 31st.
However, after vaccination, the proportion of individuals over the age of 60 has declined. The study recorded 2.2 confirmed infections per 1,000 people over the age of 60 who were vaccinated with Covid in late February and 1.7 infections per 1,000 people vaccinated in late March.
“The association between confirmed infection rates and vaccination duration provides a measure of weakened immunity,” said a report released on October 27. “If immunity is not weakened, it is expected that there will be no difference in infection rates between people vaccinated at different times.”
Researchers said similar results were obtained across age groups, but warned that weakened immunity in individuals aged 16 to 59 could be biased. February.
Researchers also did not “separate the contribution of vaccine breakthroughs due to weakened immunity from the contribution of dominant mutant changes” this summer. According to the report, more than 98% of Israeli positive cases were due to delta mutations as of June, and analysis clearly shows the effect of weakened immunity on deltas. ..
The study added that the Israeli Ministry of Health used the findings to justify approving the booster at least five months after receiving the second dose of Pfizer on July 30. Modana When Johnson & Johnson Also this autumn.
Boosters are available in the United States Pfizer and Moderna recipients 65+, adults with potential Covid complications, 18+ people living or working in a collective environment, and the forefront of exposure to the virus Employees. All adult J & J recipients are eligible for boosters, regardless of medical or occupational risk factors.
Israel started by giving boosters to people over the age of 60 In JulyHowever, Prime Minister Naftali Bennett announced on August 29 that anyone over the age of 12 could aim for a third shot.
Pfizer CEO Albert Bourla Said in July The effectiveness of the company’s Covid vaccine dropped to about 84% within 4-6 months after the second vaccination.But Israeli data Published that month Pfizer’s vaccine has been shown to be only 16% effective in preventing symptomatic disease in recipients who completed a series of injections in January.
NIH director urges Americans to get Covid boosters to prevent breakthrough infections
Source link NIH director urges Americans to get Covid boosters to prevent breakthrough infections
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