What Immunity to COVID-19 Really Means

The U.S. Food and Drug Administration recently granted an “emergency use authorization” of a blood test for antibodies against SARS-CoV-2, the novel coronavirus that causes COVID-19. It is the first such test to receive approval for the U.S. market. And it comes at a time when health experts and leaders are embracing immunity as a potential end point to the pandemic. In Colorado, a company that makes a coronavirus antibody test has donated kits to the state’s San Miguel County so that everyone there can be tested if they want...