The coronavirus detected for the first time on the wholesale of Huanan seafood in Wuhan, China,
Héctor Retamal / AFP Getty Images
When the first symptoms of an unknown virus started to display up in Wuhan, China, in December 2019, scientists ran to figure out what going on. In the five years since, they have not stopped running, with more than a million articles published on SARS-COV-2 and Covid-19. Yet, in spite of this outpouring, big clinical questions about the virus remain.
Early in the pandemic, it became clear that the coronavirus could jump from humans into other animals and back…