UK approves trial exposing volunteers to Covid, a first
                                     Britain became the first country in the world on Wednesday to give the go-ahead for human challenge trials in which volunteers will be deliberately exposed to Covid-19 to advance research. The trial, due to start within a month, will see up to 90 healthy volunteers aged between 18 and 30 exposed to the smallest amount of the virus needed to cause infection.
                                    
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