GENEVA—Sylvie Briand landed in China looking for answers. Nearly a month had passed since word of a mysterious pneumonia had emerged. It was now late January and the World Health Organization was struggling to learn more about it. Frustrated with mounting cases and limited information from China, the WHO’s top brass, including Dr. Briand, flew to Beijing to resolve a burning question: How easily did this new disease spread?

Source: Wall Street Journal August 28, 2020 14:40 UTC