Researchers Infect Volunteers With Coronavirus, Hoping to Conquer Covid-19 – Wall Street Journal

By Jenny Strasburg Sept. 4, 2021 530 am ET LONDON—Much of the world spent the past year taking vaccines and wearing masks to evade Covid-19. In the U.K., almost four dozen volunteers have had the virus dripped into their noses by syringe in clinical experiments. So-called human challenge studies—which intentionally expose healthy people to viruses […]