Sat 28 Mar 2020 08.00 GMT

When the definitive history of the coronavirus pandemic is written, the date 20 January 2020 is certain to feature prominently. It was on that day that a 35-year-old man in Washington state, recently returned from visiting family in Wuhan in China, became the first person in the US to be diagnosed with the virus.

On the very same day, 5,000 miles away in Asia, the first confirmed case of Covid-19 was reported in South Korea. The confluence was striking, but there the similarities ended.