Reality check: Only 17% of U.S. adults have received a booster shot, according to the CDC, although many of those people haven’t received their primary series within the last six months and are not yet eligible.

Between the lines: NIAID director Anthony Fauci told Axios earlier this week that changing the definition federally “hasn’t been on the table yet,” but didn’t rule it out in the future.

That means a patchwork set of definitions could emerge across the country, at least in the short term.

And given the growing number of vaccine mandates in place, formally changing the definition of fully vaccinated could be much more significant than a simple change in rhetoric.