News came out last week that the FDA had only approved booster shots for those who had received the Pfizer shot and were 65 years old or older, or at high risk of developing severe COVID symptoms. Previous signals from the Biden administration were that third shots would be widely available to the public.

“The reality is, we do know that there are billions of people around the world who need vaccines, we know that you are well protected with a two-vaccine regimen against hospitalization and death,” said Dr. Vanessa Kerry, director of the Global Public Policy & Social Change program at Harvard Medical School. “And we know that there’s also an economic argument — beyond the moral argument — that says that high-income countries, us, the United States, will actually financially and economically be in a better-off position if we are vaccinating the world.”

Kerry joined host Jim Braude on Greater Boston Monday, the same day that Pfizer announced that its COVID-19 vaccine was safe and highly effective in 5- to 11-year-olds. The company planned to submit the data to the FDA for emergency use authorization.

WATCH: Kerry on the latest developments in COVID-19 vaccines