After weeks and weeks of millions of people sheltering-in-place across the country because of COVID-19, there is talk of possibly reopening parts of the economy. Still, many public health experts insist the right conditions need to be created before we can begin to find a path back to life as we once knew it.

Yonatan Grad, assistant professor of Immunology and Infectious Diseases at the Harvard T. H. Chan School of Public Health, is one of a growing chorus of voices calling for a dramatic increase in coronavirus testing. He looks at the ways this pandemic could end, and explains why much more data is urgently needed to control the spread of the disease and limit the threat of uncontrolled outbreaks.