When the first signs of an unknown virus started appearing in Wuhan, China in December 2019, scientists scrambled to understand what was happening. In the five years since then, they haven’t stopped running. 1 million papers Published about SARS-CoV-2 and covid-19. But despite this surge, some big scientific questions about the virus remain.
Is the virus hiding in wild animals?
Early in the pandemic, it became clear that the coronavirus could jump from humans to other animals and back again.
Source: www.newscientist.com