New coronavirus test is imperfect step toward mass screening

A new type of coronavirus test offers a cheaper, quicker way to screen for infections, moving the U.S. toward the kind of mass screening that experts say is essential to returning millions of Americans to school and work.It is less accurate than the current gold standard for testing and can only be run on specialized equipment.“It is too early to tell,” said lab researcher Patricia Simner of Johns Hopkins University, assessing the test's impact.