Antibody tests that could help determine who has had the virus are being developed Dr. Anthony Fauci said. There's hope those people will have some measure of immunity.The CDC issued return-to-work guidelines for critical workers who had contact with someone who had a confirmed or even suspected case of COVID-19.Scientists are trying to figure out whether changing seasons will affect the spread of the coronavirus.Plus, how public health experts create models to help us predict where the outbreak is headed. Wuhan resident Piso Nseke's conversation with Mary Louise Kelly about his first day outside after almost three months of lockdown.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.