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Johnson & Johnson Krem do Twarzy - Odkryj Tajemnice Zdrowej i Promiennej Skóry
Making Antibodies
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Who should get the J&J vaccine?
The vaccine is authorized for people age 18 and older.
How long does it take for protection to kick in?
With all three vaccines, immunity builds over a few weeks after immunization. Data from Johnson & Johnson show that most vaccinated trial participants had a robust immune response 15 days after getting the shot, with significant protection reached by day 29.
Will I be as well protected against getting super sick with COVID-19 if I get the J&J shot as if I get a two-dose version from Pfizer or Moderna?
"When we look at the thing we probably care about most — making sure that we don't end up in the ICU or dying — the efficacy of the three vaccines is virtually identical," says Dr. Kirsten Bibbins-Domingo, chair of the department of epidemiology and biostatistics at the University of California, San Francisco.
But you can't really compare those numbers head to head, says Pierre, because "these were different trials in different places at different times," and the strains of the coronavirus running around were likely somewhat different. The Johnson & Johnson vaccine was tested more recently, including in South Africa and Brazil, at a time when more contagious variants of the coronavirus were widely circulating in those countries. The Moderna and Pfizer clinical studies, meanwhile, were started earlier, before such variants had become widespread.
Entering a Cell
After the vaccine is injected into a person’s arm, the adenoviruses bump into cells and latch onto proteins on their surface. The cell engulfs the virus in a bubble and pulls it inside. Once inside, the adenovirus escapes from the bubble and travels to the nucleus, the chamber where the cell’s DNA is stored.
An Overview of the Johnson & Johnson COVID-19 Vaccine
The Johnson & Johnson COVID-19 vaccine is no longer available in the United States after the remaining stock of the vaccine expired in May 2023 . The FDA then revoked the vaccine's EUA in June after the manufacturer requested its voluntary withdrawal.
On February 27 2021, Johnson & Johnson's vaccine against coronavirus disease 2019 (COVID-19) became the third COVID-19 vaccine to receive Emergency Use Authorization (EUA) from the FDA.
The company worked with its pharmaceutical arm Janssen to develop the vaccine under the project names Ensemble and Ensemble 2. The company enrolled participants for its late-stage in September 2020 and tested its vaccine with two different doses.
