Michelle Cortez And Heejin Kim Bloomberg

Weeks before China disclosed it was investigating a cluster of mysterious pneumonia cases in Wuhan -- what the world now knows as Covid-19 -- South Korea's top health officials gathered to plan their response to a theoretical health threat.

Weeks before China disclosed it was investigating a cluster of mysterious pneumonia cases in Wuhan -- what the world now knows as Covid-19 -- South Korea's top health officials gathered to plan their response to a theoretical health threat.