The Food and Drug Administration on Thursday authorized its first emergency use coronavirus serology test, opening the way for a possible treatment for COVID-19, which has infected some 1 million worldwide and killed more than 51,000. The test will determine if a person has been infected. The test was developed by Cellex Inc. and involves a blood draw done at a certified lab. It can provide results in 15 minutes. “Based on the totality of scientific evidence available to FDA, it is reasonable to believe that your product may be effective in diagnosing COVID-19,” FDA chief scientist Denise M. Hinton...