As several nations begin relaxing their lockdowns following an initial peak in COVID-19 cases, attention is turning to how they can avoid a "second wave" of infections as social distancing is eased.
Italy and Spain -- two of the hardest hit countries -- have already started allowing people outside to exercise for the first time in nearly two months, and several US states are allowing businesses to reopen.
In France, where confinement measures are set to lift on May 11, Prime Minister Edouard Philippe said there is a "fine line" between lifting restrictions on movement and avoiding a new surge in infections of a disease that has killed nearly a quarter of a million people globally.