> Later, a vaccine candidate that has been proven safe in clinical trials could be given to a group of healthy adults in this age range, who are then exposed to the virus in a controlled environment. They would then be closely monitored by medics and researchers to see if the vaccine is successful in preventing infection, as well as identifying any side effects.

> https://www.thelancet.com/journals/lanres/article/PIIS2213-2...

I imagine they will do what they did for the vaccine candidate ChAdOx1 nCoV-2019 and swab at least every week to test for infection.

Do you have any source to back up your claim that a challenge trial wouldn’t work for SARS-CoV-2?