Deatils are in the link, but basically the London School of Hygiene and Tropical Medicine want volunteers to wear a T shirt and a mask for a few hours if they are going to take a COVID test due to symptoms, and then send the samples in to help dogs learn to distinguish the smell.
www.lshtm.ac.uk/research/centres-projects-groups/using-dogs-to-detect-covid-19?fbclid=IwAR0zM9yohNDhrJLguwPP21rZJz8Zjm0fh9JhM-ZIMu571y8ZniHGQ6VAR_0#volunteer-for-the-study
If you search 'James Logan' on facebook there are also links on there you can read and share.