This map is the key to when US might start easing Covid-19 restrictions

There is now more optimism that the worst of the coronavirus pandemic may be ending -- and as other nations lift certain Covid-19 restrictions, some public health experts question whether US counties and cities should consider easing their guidance on mask-wearing or social distancing, as well.

But others warn not to relax such measures too soon.

Denmark has decided to lift all Covid-19 restrictions within the country, Prime Minister Mette Frederiksen announced Wednesday evening, adding that Covid-19 "should no longer be categorized as a socially critical sickness."