When Will I Need a Coronavirus Vaccine Booster Shot?

Surging cases of the Delta variant of COVID-19, along with a noticed decline in immunity a few months after the vaccine, are leading to a call for getting a 3rd dose of the Pfizer and Moderna vaccines. But it's still unclear what will be recommended for people who received the Johnson & Johnson shot. Dr. Aditi Nerurkar from Harvard explains what we know and we don't about the booster shots plans.