Coronavirus: What has Hong Kong learned that can help the world fight the Covid-19 pandemic?

In 2003, severe acute respiratory syndrome (Sars) killed 300 people in Hong Kong, causing  deep psychological scars for many city residents. Now 17 years later, those Hongkongers are recalling the lessons learned from Sars as they deal with the Covid-19 pandemic. Those lessons are reflected in the policies being introduced by local authorities, and in the way ordinary people in the city are working to maintain personal hygiene.