Most people infected with the coronavirus develop antibodies in response. NPR's Richard Harris reports that scientists are trying to figure out if that means people who've been exposed are immune from reinfection and, if so, for how long.The Labor Department reported 20.5 million jobs were lost in April, putting the jobless rate at its highest level since the Great Depression. Health care workers are among those hard hit by the economy. Many are losing work as hospitals struggle financially due to a decrease in non-emergency visits and procedures. Only a few states have enough tests to ensure safe reopening. One of them, Tennessee, has taken a unique approach to testing: Its state government pays for every single test, no questions asked.Find and support your local public radio stationSign up for 'The New Normal' newsletterThis episode was recorded and published as part of this podcast's former 'Coronavirus Daily' format.