The WHO said Thursday that countries should actively test people to find coronavirus cases even if they don’t show symptoms — a stance that comes after the U.S. health agency switched its policy to say that asymptomatic contacts of infected people don’t need to be tested. At a press briefing, Maria Van Kerkhove, WHO’s technical lead for COVID-19, said when officials are investigating clusters of COVID-19, “testing may need to be expanded to look for individuals who are on the more mild end of the spectrum or who may indeed be asymptomatic.”