The Centers for Disease Control has given final approval for all U.S. adults to receive the Pfizer and Moderna booster shots, but New York City had already expanded booster eligibility to all adults a few days ago in an effort to get ahead of a possible winter surge.

Dr. Stella Safo, the founder and executive director of Just Equity for Health, joined Zack Fink on “Inside City Hall” to discuss the science behind the shots.