U.S. President Joe Biden announced Tuesday that he’s bumping up his deadline by two weeks for states to make all adults in the U.S. eligible for coronavirus vaccines. But even as he expressed optimism about the pace of vaccinations, he warned Americans that the nation is not yet out of the woods when it comes to the pandemic. The president warned that ” new variants of the virus are spreading and they’re moving quickly. Cases are going back up, hospitalizations are no longer declining.” He added that “the pandemic remains dangerous,” and encouraged Americans to continue to wash their hands, socially distance and wear masks. Biden added that while his administration is on schedule to meet his new goal of distributing 200 million doses of the vaccine during his first 100 days, it will still take time for enough Americans to get vaccinated to slow the spread of the virus. Biden also announced that 150 million doses of COVID-19 vaccine have been shot into arms since his inauguration on Jan. 20.