by
MARGARET HAMBURG
and
MARK SMOLINKSI
CONTAGION As 2019 drew to a close, a few dozen people, mostly in the Chinese city of Wuhan, caught a novel coronavirus and came down with pneumonia. In only a few weeks, the outbreak has spread to at least 20 other nations and is now an international health crisis.
PAUL YEUNG/BLOOMBERG/GETTY
IN 2011, a novel virus,MEV-1, emerged from China and quickly spread throughout the world, killing 2.5 million people in the U.S. and 26 million worldwide.