What are human problem trials?

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Volunteers are set to be intentionally contaminated with Covid-19 after the UK Government stated it should arrange human problem trials to hurry up the event of a vaccine.Human problem trials are regarded by some as a sooner solution to develop vaccines – however they arrive with large dangers.They’ve been used for lots of of years however lots of people query how moral is to intentionally expose folks to an infectious illness.More than 140 completely different organisations around the globe are at the moment attempting to find a vaccine for Covid-19.But may problem trials be used to hurry up the method? What is a human problem trial?BBC Health Correspondent Laura Foster explains how they work.Video by Terry Saunders, Megan Fisher and Laura Foster.