Health
Researchers found that the vaccine was able to prevent infection as the delta emerged.
Although the coronavirus vaccine provided essential workers with strong protection against infection earlier this year, The effect has decreased A study released Tuesday by federal health officials found that the highly contagious delta mutant became the predominant form of the virus.
It was not clear whether the reduced protection was due to the appearance of delta mutants or an extension of the period from the start of inoculation. Vaccine efficacy showed signs of decline that could begin four months after vaccination was first started.
“What we were trying to understand was whether this was a delta or a diminished effect,” said Dr. Foulks. “Our conclusion is that we can’t really say.”
Researchers tracked thousands of first responders and healthcare workers who were unable to work remotely in eight locations: Arizona, Florida, Oregon, Texas, Utah, and Minnesota. Participants were tested weekly for coronavirus infection for 35 weeks. It was also tested whenever Covid-like symptoms appeared.
Most of the vaccinated workers were vaccinated with the Pfizer-BioNTech vaccine. One-third were vaccinated with Moderna and 2% were vaccinated with Johnson & Johnson.
Overall, vaccines compare infections of vaccinated workers to unvaccinated workers by 80% from December 14th to August 14th, when the US vaccination campaign began. Reduced. (Results were tailored to factors such as occupation, demographic characteristics, frequency of close social contact, and mask use.)
However, before the emergence of the Delta variant, the shot reduced infection by 91%, while the predominance of the variant in each region reduced protection to 66%.
Ashley Foulks, an epidemiologist in Covid-19’s response, said: The Centers for Disease Control and Prevention team and lead author of the study.
“But I would also like to emphasize that 66% effectiveness is a very high number,” she added. “Although not 91%, the risk of infection for vaccinated participants is reduced by two-thirds.”
However, due to the short observation period and low total number of infections during Delta’s predominance, the decline in efficacy “should be interpreted with caution,” Dr. Foulx said.
Understand Vaccine and Mask Obligations in the United States
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- Vaccine rules.. August 23, Food and Drug Administration Fully approved by Pfizer-BioNTech’s coronavirus vaccine For people over the age of 16, it paves the way for increased obligations in both the public and private sectors.Private companies Increasingly obligatory vaccines For employees.Such a mission Legally permitted And it has been upheld by court complaints.
- Mask rule.. Centers for Disease Control and Prevention in July Recommended All Americans wear masks in indoor public places within the area of ​​the outbreak, regardless of vaccination status. This is the reverse of the guidance provided in May. Find out where CDC guidance applies, And where The state has its own mask policy.. The battle for masks is controversial in some states. Local leaders against state bans..
- University. More than 400 universities require students to be vaccinated with Covid-19. Almost everything is in the states that voted for President Biden..
- school..both California When New York City Introduced vaccine obligations to education staff. According to a survey released in August, many American parents with school-age children I’m against the vaccines that students are required to do, More supportive mask obligations for students, teachers and staff who do not have shots.
- Hospitals and medical centers.. Many hospitals and major healthcare systems require employees to be vaccinated with the Covid-19 vaccine. It cites an increase in the number of cases caused by Delta variants and a stubbornly low vaccination rate in their community, even within their workforce.
- New York City..Vaccination proof is required for workers and customers Indoor dining, gym, performance And other indoor situations. However, enforcement will not begin until September 13. Teachers and other educational workers The city’s vast school system requires at least one vaccination by September 27, without the option of weekly testing. Municipal hospital workers You will also need to be vaccinated or have a weekly test. Employees in New York have similar rules.
- At the federal level. The Pentagon has announced that it will mandate the country’s coronavirus vaccination. 1.3 million active troops “At the latest” by mid-September.President Biden announced: All private federal officials need to do it Get vaccinated against coronavirus Or submit regular tests, social distances, mask requirements and restrictions on most trips.
Another CDC study published on Tuesday Infectious diseases analyzed Hospitalization in Los Angeles County from May 1st to July 25th this year. Researchers conclude that while vaccinated individuals were infected, unvaccinated individuals were 4.9 times more likely to be infected and hospitalized 29 times more than unvaccinated individuals. I did.
Of the 43,127 infectious diseases known to residents over the age of 16 in Los Angeles County, 25% were fully vaccinated, 3.3% were partially vaccinated, and 71.4% were unvaccinated. (The proportion of fully vaccinated Los Angeles County residents increased from 27% on May 1st to 51% on July 25th.)
3% of vaccinated individuals needed to be hospitalized, 0.5% were admitted to the intensive care unit, and 0.2% required mechanical ventilation. Equivalent proportions of unvaccinated individuals were 7.6%, 1.5%, and 0.5%, the study reported.
On average, those who were hospitalized despite being vaccinated were older than those who were not vaccinated. The mortality rate of vaccinated people was low, and the mortality rate of unvaccinated people was 0.6%, but 0.2%. The median age at death was also higher for vaccinated individuals, at 78 years, while the median age for unvaccinated individuals was 63 years.
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Sources 2/ https://www.nytimes.com/2021/08/24/health/delta-covid-vaccine-infection.html The mention sources can contact us to remove/changing this article |
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