D.C. Mayor Muriel Bowser joined dozens of other U.S. mayors in a challenge to vaccinate 70% of adult residents by July 4.

Health reporter Chelsea Cirruzzo pointed out Bowser’s participation on Twitter Wednesday.

The challenge, presented by the U.S. Conference of Mayors, urges leaders to boost vaccine efforts through the month of June with the goal of getting 70% of their populations partially vaccinated by the Fourth of July, in line with the goal set at the beginning of May by President Joe Biden. Mayor of Atlanta Keisha Lance Bottoms and Chicago Mayor Lori E. Lightfoot are among the 54 mayors that have also signed on to participate.

Unlike other jurisdictions that linked reopening steps to reaching vaccination benchmarks, Bowser and the city’s health department have said that coronavirus case metrics guided their decision to lift nearly all pandemic restrictions last month. The new mayoral challenge marks one of the first clear statistical vaccination goals set by Bowser.

A spokesperson for Bowser did not immediately return DCist’s request for comment on her participation in the challenge.

As of June 2,  53.2% of D.C. residents ages 18 and older have been fully vaccinated, according to CDC data.  Per the city’s data which includes all residents over age 12, a little over 40% of the population has been fully vaccinated, and 51.2% are partially vaccinated (the real number could be higher, given that some eager residents traveled to other states for their shots). But gaps in who is getting vaccinated and who is still getting the virus continue to widen. The Washington Post reported last month that Black residents now account for 80% of the city’s new coronavirus cases, while predominantly-Black neighborhoods have reported lower rates of vaccination than wealthier, whiter parts of the city since the beginning of the rollout. In Ward 8, 18% of all residents have received a vaccine, compared to 41% in Ward 3.

The vaccine scene in D.C. has shifted drastically since its early days, which were marked by overwhelming demand, crashing appointment sign-up websites. With demand now falling behind supply, D.C. has announced plans to shut down some of its walk-up sites in the coming weeks, and launched a new program that allows employers, faith organizations, and community groups to directly request a vaccine clinic from DC Health. D.C. has also led two community canvassing events to reach residents who have yet to get their shots, stood up several pop-up sites at faith organizations and community centers, and started offering freebies to boost vaccine uptake.

In addition to city-run walk-up sites, residents who need a vaccine can check out a number of pharmacies in D.C. that are offering shots.

This story was updated to clarify that Bowser wants 70% of adult residents to get partially vaccinated by July 4.