Nearly two decades ago, China was at the heart of a public health crisis over a deadly new virus. It said it had made lifesaving reforms since. So why is the Wuhan coronavirus now spreading so rapidly across the world? Our correspondent went to the center of the outbreak to find out. Guest: Javier C. Hernández, a New York Times correspondent based in Beijing. For more information on today’s episode, visit nytimes.com/thedaily.