Children exercise from the rooftop of their building during and outdoor workout class imparted by physical trainer Ivan Nascimento for his neighbors during a quarantine imposed by the state government to help contain the spread of the new coronavirus in the Brasilandia neighborhood of Sao Paulo, Brazil, Sunday, May 17, 2020. (AP Photo/Andre Penner)
May 17, 2020
Stories this photo appears in:
May 17, 2020 9:43 p.m.
US, European leaders weigh reopening risks without a vaccine
On a weekend when many pandemic-weary people emerged from weeks of lockdown, leaders in the U.S. and Europe are weighing the risks and rewards of lifting COVID-19 restrictions knowing that a vaccine could take years to develop