A public health expert on how to avoid 'horrible December'

Several U.S. public health leaders warned this weekend that the coronavirus is spreading unchecked throughout the country -- and likely to become significantly worse in the coming days and weeks. Unlike in the spring and summer, virus cases are rising in 49 of 50 states. William Brangham looks at the urgency of the situation with Dr. Ashish Jha, dean of Brown University’s School of Public Health.