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COVID-19: Healthy volunteers to be re-exposed to virus – BBC Focus Magazine

Researchers will investigate what kind of immune response can stop people from becoming re-infected as part of a new human challenge trial.

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Healthy, young volunteers who have previously had COVID-19 will be deliberately exposed to the virus for a second time to see how the immune system reacts as part of a new UK study.
Researchers at the University of Oxford have launched what is known as a human challenge trial to look at what happens when someone who has recovered from COVID-19 infection is then re-exposed to the virus.
They will aim to determine what dose of virus is needed to re-infect after natural infection, how the immune system…

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