The U.K. approved the world’s first COVID-19 human challenge trial
It will deliberately infect people to find out how much coronavirus it takes to sicken someone
![illustration of coronavirus SARS-CoV-2](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/02/021721_jl_challenge-trial_feat.jpg?fit=1030%2C580&ssl=1)
In the first approved human challenge trial for COVID-19, which will take place in the United Kingdom, researchers will intentionally expose volunteers to the coronavirus (illustrated) to determine the minimum dose of virus that can cause infection.
Radoslav Zilinsky/Moment/Getty Images