From Calculated Risk:
Some countries have been able to open their economies without an increase in [coronavirus] infections. For example, in Japan, the economy is mostly open, however 1) everyone wears a mask, 2) there is robust contact tracing, and 3) everyone is urged to follow the 3 C’s (avoid Closed spaces, Crowded places, and Close-Contact settings). However, in the US, contact tracing is still ramping up, many people aren’t wearing a mask or face covering, and many people are not following the 3Cs.
Source: Calculated Risk: Economic Outlook: The Gathering Storm