Pandemic Prevention

More than a year and a half since COVID-19 was identified in Wuhan, China, it’s still unclear where the virus actually came from. Was it a bat or another animal? Did it accidentally escape from a coronavirus research lab in Wuhan? Most importantly, how will we prevent the next pandemic from a virus as stealthy as this one? Infectious disease epidemiologist Maureen Miller at Columbia University says we can’t wait for people to start showing symptoms. (Segment produced by Sydney Jezik)