President Joe Biden got a booster shot of the Pfizer COVID-19 vaccine at the White House Monday afternoon (watch above), days after officials at the Federal Drug Administration and the Centers for Disease Control and Prevention authorized the additional dose for seniors 65 and older, frontline workers, people with certain underlying health conditions, and those living in institutions, like homeless shelters, with a higher than average risk of exposure.

Qualifying Americans are encouraged to get the booster six months after their second Pfizer jab. The 78-year old president received his second shot on January 11th, a week and a half prior to his inauguration.

Before rolling up his sleeve, Biden told reporters “boosters are important, but the most important thing we need to do is get more people vaccinated.”

Biden said the “distinct minority” of Americans who have not yet received a single jab – about 23% of the adult population – are “causing an awful lot of damage for the rest of the country. This is a pandemic of the unvaccinated.”

“Please, do the right thing. Please get the shots. It can save your life. It can save the lives of those around you and it’s easy, accessible, and it’s free.”

Biden told reporters that he did not experience side effects from his previous Pfizer jabs. He said First Lady Jill Biden would be getting her booster in the coming days; she was unavailable on Monday since she was teaching.

The World Health Organization Director-General Tedros Adhanom Ghebreyesus has criticized the use of boosters in wealthy nations, saying resources should instead be directed to poorer countries struggling to offer initial rounds of inoculation to their citizens.

Asked about that stance on Monday, Biden said the U.S. is already doing “the largest part in the world to get every one vaccinated.”