Heidi Ledford A lab technician works on the production of molnupiravir, an oral antiviral drug that some countries have authorized for use against COVID-19. Credit: Amr Abdallah Dalsh/Reuters/Alamy It takes Lawrence Tabak about 15 minutes to rattle off all the potential COVID-19 treatments being tested in the clinical trial programme he oversees: a lengthy, tongue-twisting...
