TWiV explains why hydroxychloroquine failed in humans despite showing antiviral effects in cells, and reviews the published data on the Pfizer/BioNTech mRNA vaccine.

On this episode, FDA EUA for Pfizer mRNA vaccine, efficacy of AstraZeneca ChAdOx1 COVID-19 vaccine, and an orally administered drug that blocks SARS-CoV-2 transmission in ferrets.