The United States on Monday finally reached President Biden’s goal of having 70 percent of eligible adults at least partly vaccinated.

The milestone came a month later than the president had hoped as the country faced the rapid spread of the highly contagious Delta variant.

There was no celebration at the White House. The announcement today was made on Twitter by Cyrus Shahpar, the COVID-19 data director for the Biden administration. “Let’s continue working to get more eligible vaccinated!” Mr. Shahpar wrote.

much more contagious than other forms of the virus, and may cause more severe disease, according to an internal presentation circulated recently within the Centers for Disease Control and Prevention.

Experts say that infections in vaccinated people are still relatively uncommon, and even in those cases, the vaccines currently authorized in the United States appear to provide protection against severe illness and death.