China fears second wave of coronavirus over imported cases

As daily reported cases in mainland China plummet, life is slowly returning to normal in many cities, but concern over a second wave of infections is dwarfing the country's recovery. CNN reviews ongoing efforts to safely balance a return to business and prevent a resurgence of infections. With the majority of new cases in the country classified as imported, China has stepped up detection and quarantine of international travelers, along with monitoring residents through follow-up and huge tracking of their personal data. From Shanghai, CNN's David Culver takes a look at what is being done to prevent the pandemic, which continues to spread around the world, from making the Chinese population sick again.