Since COVID-19 vaccines began to be used, the question of how long they stay immune for has kept coming back. A study by scientists from Washington University in Saint Louis shed new light on this issue. It’s a good news.
- Public vaccinations against COVID-19 are ongoing all over the world. However, the duration of immunity obtained after vaccination raised doubts from the beginning
- Vaccine company bosses openly admitted that a third dose, or even annual vaccination, may be needed to maintain immunity against coronavirus
- According to a study published in Nature, the concerns may be unfounded
- More information can be found on the Onet homepage.
Vaccinations against COVID-19. A third dose of vaccine may not be needed
As the “New York Times” writes, in the course of the study, scientists analyzed 41 vaccinated participants in terms of the level of activity of the so-called B lymphocyte reproductive centers, responsible for the production and evolution of anti-virus antibodies.
Although these elements usually disappear as early as one month after vaccination, they were still highly active for all study participants 15 weeks after receiving the first dose of the vaccine. This suggests not only long-term immunity, but also – due to cell evolution – resistance to various mutations of the virus.
A study by scientists from St. Louis was the first of its kind, but another one that suggested the long-term immunity that vaccines provide. This in turn means that additional doses of vaccines may not be necessary – especially for people who have had COVID-19 and have been vaccinated. However, a potential threat is the evolution of the virus, which may allow it to “bypass” antibodies in the future.
“Anything that requires a booster will be based on a new variant, non-vanishing immunity,” Deepta Bhattacharya, an immunologist at the University of Arizona, told NYT.
According to team leader Ali Ellebeda, in people who have not been infected with the coronavirus but are vaccinated, a booster dose may have the same or better effect than a previous infection, providing long-term immunity to other variants of the virus as well.
Ellebedy added that although people vaccinated with the single-dose Johnson & Johnson preparation did not participate in the study, he suspects that the vaccine does not trigger such a strong immune system response as the mRNA preparations, i.e. Pfizer and Moderna.
osk / kib / PAP
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- What do convalescents need to know before going to vaccination?
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