Why herd immunity is 'dangerous' as a COVID-19 strategy

Across the globe, governments and health officials are grappling with how to contain COVID-19 while keeping society open. One idea that has been raised is seeking widespread immunity by allowing a larger and healthier segment of the population to become infected with the virus. But many experts say that’s a dangerous path. Amna Nawaz talks to virologist Angela Rasmussen of Columbia Public Health.