Scientists describe the moment they realised this was ‘the big one’, and the chances that were missed
Pandemics, it has been said, are lived forwards but only understood backwards.
At the end of a year in which Covid-19 has claimed 1.7 million lives since it was first identified in the Chinese city of Wuhan last December, experts are now wondering if, and when, there was a turning point when the spread of the disease became globally unstoppable.
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