testing

Medical workers and researchers in states across the U.S. are now gathering the crucial data needed to understand the new coronavirus and its spread. They’re testing large groups of people for the virus, regardless of whether the person feels sick or has reason to believe they’ve been exposed.

Scientists across the U.S. are developing new tests meant to detect whether someone is infected by the novel coronavirus in much less time than conventional tests now available—from five hours to as short as five minutes. But these newer tests still present familiar challenges, namely whether they’ll be accurate or…