Carolyn Johnson reports on the race to develop a vaccine for the novel coronavirus and how it could pit countries against one another. Ben Guarino on why bioethicists are thinking hard about coronavirus vaccine testing. And Maura Judkis on why so many people are convinced that they had covid-19 already.Read more:The biggest challenge for a coronavirus vaccine could be getting countries to share.Volunteers are signing up to put their lives on the line for a coronavirus vaccine.Many are convinced that they’ve already had covid-19.Subscribe to The Washington Post: https://postreports.com/offer