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In the Czech Republic, masks have been compulsory since March 18th. The country has only 2 deaths (as at March 24) and the growth of new cases has flattened.
One of the key reasons is a massive country-wide community initiative to create and wear home-made masks. In just 10 days the country went from no mask usage to nearly 100% usage, with nearly all the masks made at home with easily accessible materials, like old t-shirts.