How countries know when it's safe to end lockdown, based on COVID-19 infection rates and testing capability

Stephane Cardinale/ Getty Images As countries around the world begin to slowly reopen during the COVID-19 pandemic, the criteria for doing so safely is not always made clear to the public. Some nations are pushing to reopen for political reasons, and others are eager to get their economies up and running and put people back to work. Before fully reopening, experts say it's vital the country has the ability to test, track, and trace every new potential case to prevent further outbreaks, and maint...