From https://www.wsj.com/articles/masks-could-help-stop-coronavirus-so-why-are-they-still-controversial-11593336601 https://www.wsj.com/articles/masks-could-hel

From https://www.wsj.com/articles/masks-could-help-stop-coronavirus-so-why-are-they-still-controversial-11593336601 https://www.wsj.com/articles/masks-could-help-stop-coronavir... > Hong Kong, with 7.5 million residents, is one of the most densely populated places on earth, but recorded only six deaths from Covid-19 despite having no lockdown and receiving nearly 350,000,travelers a day from abroad until authorities started reducing cross-border travel on January 30. > The key secret of Hong Kong’s success, Prof. Yuen said, is that the mask compliance rate during morning rush hour is 97%. The 3% who don’t comply are mainly Americans and Europeans, he said. ... > The Czech Republic was the first European country to impose mandatory mask-wearing in some public spaces on March 18, before it recorded the first death by Covid-19. It has since reduced the number of daily new infections to below 50 and has one of the lowest coronavirus death rates in the world.