Where did Covid come from? Five mysteries that remain

‘In the wake of the World Health Organization’s investigation, there are still key questions about when, where and how the pandemic began.

1. Was the virus circulating in Wuhan before the first known cases?
2. Was the virus spreading in people outside China before December 2019?
3. What was the role of the Huanan market?
4. Did frozen wild-animal meat have a role in the early spread of the virus?
5. Was the virus circulating in animals in China before the pandemic?

Read here (Nature, Feb 26, 2021)