Right now, antibody tests can be a good measure of whether you've previously had #COVID19. But they aren't all equal, and key questions remain. Hear more from Gigi Gronvall and read the Center for Health Security's report on research that still needs to be done: https://www.jhsph.edu/covid-19/articles/the-potential-and-limits-of-antibody-testing.html | Johns Hopkins Bloomberg School of Public Health