Testing for the coronavirus would have to be at least doubled or tripled from its current levels to allow for even a partial reopening of America’s economy, public health experts say, but it is unclear how soon such an ambitious goal could be reached amid persistent shortages of testing supplies and a lack of coordination from the Trump administration.

Without diagnostic testing on a massive scale, federal and state officials and private companies will lack a clear picture of who has been infected, who can safely return to work, how the virus is spreading and when stay-at-home orders can be eased, public health experts say.

“We are an order of magnitude off right now from where we should be,” said Dylan George, an expert in infectious disease modeling who advised the administration of President Barack Obama in combating the Ebola epidemic. “Testing is the perpetual problem here.”