The CDC has started administering antibody tests to gauge true scale of coronavirus spread

The Centers for Disease Control and Prevention confirmed Saturday it has begun conducting antibody tests to determine the true number of people infected with the novel COVID-19 coronavirus, including those who never developed symptoms. Unlike normal diagnostic tests, the antibody test can detect if a person has recovered from an earlier infection. If so, there's a chance they've built up some protection, which could help inform future responses to the virus and perhaps even allow some people to ...