Dr. Anthony Fauci said Tuesday that the definition of being fully vaccinated may “without a doubt” change, meaning that a booster shot could be needed to maintain that status.

"Right now, officially, fully vaccinated equals two shots of the mRNA and one shot of the J&J, but without a doubt that could change," Fauci said in an interview for the upcoming Reuters Next conference.

"That's on the table for discussion,” he said.

The country's standard for being fully vaccinated is under consideration because it is believed that the booster is what is providing the highest level of protection.

Fauci hopes to see an “overwhelming majority” get the booster shot because the booster is what gives "substantial" protection against being infected.

All adults can get a booster shot, following the Food and Drug Administration's official authorization and the Centers for Disease Control and Prevention also signing off on the expanded eligibility.

According to the CDC, 36.6 million adults have received a booster shot.