UK Begins First COVID-19 Human Challenge Trial. What Can Participants Expect? 10/04/2021 Image: Ivan Diaz/Unsplash Jimmy Bernot watched with interest as the nurse carefully transferred a small amount of liquid containing dozens of hookworm larvae onto a piece of gauze, and then placed it on his wrist. Bernot couldn’t see the larvae – at just about half a millimetre long, they are all but invisible – but he could soon feel them: a tingling, itchy sensation as the worm larvae wriggled through his skin and into his bloodstream. From there, Bernot knew, the hookworms would travel...