Johnson & Johnson has paused Phase 3 trials for its COVID-19 vaccine candidate, after one patient reported an “unexplained illness.” This comes after AstraZeneca paused its Phase 3 trials due to an adverse event, and Moderna slowed its trial because of enrollment difficulties. Dan discusses these developments and more with Dr. Tom Frieden, who led the CDC between 2009 and 2017. Plus, Axios chief financial correspondent Felix Salmon joins to discuss official unemployment vs. “true” unemployment in the U.S.