Blood tests for the coronavirus could play a key role in deciding whether millions of Americans can safely return to work and school.
But public health officials warn that the current “Wild West” of unregulated tests is creating confusion that could ultimately slow the path to recovery.
More than 70 companies have signed up to sell so-called antibody tests in recent weeks, according to U.S. regulators. Governments around the world hope that the rapid tests, which typically use a finger-prick of blood on a test strip, could soon ease public restrictions by identifying people who have previously had the virus and have developed some immunity to it.