Mass gatherings, erosion of trust upend coronavirus control

New York • Protests erupting across the nation over the past week — and law enforcement's response to them — are threatening to upend efforts by health officials to track and contain the spread of coronavirus just as those efforts were finally getting underway.Health experts need newly infected people to remember and recount everyone they've interacted with over several days in order to alert others who may have been exposed, and prevent them from spreading the disease further.