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We finally know why some people seem immune to catching covid-19

Unique cell responses mean some people may be immune to catching the coronavirus, even if they are unvaccinated

By Sonali Roy

19 June 2024

Volunteers have been exposed to the coronavirus that causes covid-19 as part of a scientific study


Deliberately exposing people to the coronavirus behind covid-19 in a so-called challenge study has helped us understand why some people seem to be immune to catching the infection.

As part of the first such covid-19 study, carried out in 2021, a group of international researchers looked at 16 people with no known health conditions who had neither tested positive for the SARS-CoV-2 virus nor been vaccinated against it.


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