In the U.S., emergency-use authorization has been granted for convalescent plasma, the efficacy of which is yet to be robustly tested. For some, this echoes the situation with hydroxychloroquine and the government’s subsequent U-turn on its rollout. Meanwhile, America’s infection rate appears to be flattening out — but at tens of thousands of cases per day. This stands in stark contrast to China, where daily cases are under 40. Overseas, a Hong Kong resident has been reinfected with the virus, the first recorded instance of a second bout. And Russia and China have begun distributing vaccines, sidestepping Phase 3 safety trials to the incredulity of immunologists and vaccine executives. We check back in with Donald G. McNeil Jr. on the coronavirus and the impact of these developments. Guest: Donald G. McNeil Jr., a science and health reporter for The New York Times  For more information on today’s episode, visit nytimes.com/thedaily  Background reading: A 33-year-old man in Ho...