Joe Biden promised as president-elect to get 100 million coronavirus vaccine shots in American arms during his first 100 days in office; since taking office, he's more than doubled that goal — and more than a quarter of Americans are now fully vaccinated.

By the numbers: Not quite 1% were vaccinated when Biden took office, although the Trump administration managed to reach an important milestone of 1 million doses administered in a day.

• The Biden administration has since surpassed 4 million vaccine doses administered in a day three times, according to CDC data.

Of note: AxiosSneak Peek will be counting down to Biden’s 100th day in office on Friday with data-driven analyses of the administration's accomplishments and challenges each day this week.