(CNN) The head of the World Health Organization has a simple message for all countries about who should be tested for coronavirus: "Test, test, test. While US health officials say testing is ramping up -- and while drive-through testing in several states is rolling out -- a shortage of available testing remains an issue, CNN has found. "Right now, we are playing catch up and testing people who are very sick," he said. But health officials have cited numerous cases in which people with no symptoms tested positive. On Sunday, Cherry said she "contacted another doctor to see whether there are any improvements in testing."

Source: CNN March 17, 2020 00:22 UTC