In November 2002, a deadly new virus emerged suddenly in the south of China. In less than a year, the disease it caused, known as SARS, spread to 33 countries, sickening more than 8000 people and killing more than 700. Then it disappeared. Now, researchers say, they have for the first time isolated a closely related virus from bats in China that can infect human cells. "This shows, that right now in China, there are bats carrying a virus that can directly infect people, and cause another SARS pandemic," says Peter Daszak, one of the authors and president of EcoHealth Alliance in New York City.