Researchers at the University of Oxford are looking for volunteers to take part in a human challenge trial to look at what kind of immune response can stop people from becoming infected with the original strain of the virus. A human challenge trial in medical research is a carefully controlled study that involves purposefully infecting a subject with a pathogen or bug, in order to study the effects of that infection. ">Video of What's a human challenge trial of COVID-19 like? This is the immune response we then need to induce with a new vaccine. If we know what level of immune response we need the vaccine to induce it will make future vaccine development much quicker and much more efficient.'