Antibody tests were supposed to help guide US reopening plans. They've brought more confusion than clarity amid coronavirus.

“We need to stop pretending the tests are perfect,” West said. A person who gets tested should not “suddenly stop wearing a mask or stop washing their hands. Or stop physically distancing.” The problem, West said, is tests don’t have evidence to prove they are good enough to ease policies on social distancing. “Hopefully we will get there at some point,” he said. “Right now, it feels premature.”USAToday