`If this thing boomerangs’: Second wave of infections feared

Andrea Silva, 44, waits for the results of her father’s COVID-19 disease test at the Marechal Hermes Urgent Care Unit, amid the new coronavirus pandemic in Rio de Janeiro, Brazil, Wednesday, May 6, 2020. (AP Photo/Silvia Izquierdo)

WASHINGTON — As Europe and the U.S. loosen their lockdowns against the coronavirus, health experts are expressing growing dread over what they say is an all-but-certain second wave of deaths and infections that could force governments to clamp back down.