One year on, we still know very little about how and why a new coronavirus, which killed 1.6 million and sickened 74 million people around the world, first broke out in Wuhan, writes Yvonne Murray.
In an attempt to gather more information, she travelled to the city. Just after touchdown in Wuhan, an airport official boarded the plane and gestured at me - one of two foreign nationals - to disembark first.
As we walked up the gangway, he politely explained that I was required to sign a declaration that I had not left China in the previous 30 days.
With Covid-19 largely under control in China, it is now seen as an imported problem - and foreign nationals are subject to extra scrutiny - even here in the cradle of the 2020 global pandemic. "The