The immunity test

A vaccine will take a while, but Vox’s Umair Irfan says the global effort to test for immunity and treat Covid-19 is well underway. (An earlier version of this episode misidentified hydroxychloroquine as an active ingredient in aquarium cleaner. That's chloroquine phosphate.) (Transcript here.) Learn more about your ad choices. Visit podcastchoices.com/adchoices