Human challenge trials are regarded by some as a faster way to develop vaccines – but they come with big risks.
Could they be used to speed up the development of a vaccine for Covid-19?
BBC Health Correspondent Laura Foster explains how they work.
Video by Terry Saunders, Megan Fisher and Laura Foster.
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Covid-19 is the official WHO name given to the novel coronavirus which broke out in late 2019 and began to spread in the early months of 2020.
The main symptoms of coronavirus are:
Below are stories from around the globe related to the 2020 outbreak of novel Coronavirus – since the WHO gave the Covid-19 naming. Most recent items are posted nearest the top.
Laura Foster is Senior Health, Science and Environment Reporter & Video Journalist for BBC News. Having progressed through the BBC for nearly ten years, her most recent role was with BBC Look North in Yorkshire. She has produced and featured in several covid-19 explainer videos for the BBC.
A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins.
