Democratic lawmakers are urging the Biden administration to release data on the race and ethnicity of people who have received a COVID-19 vaccine to ensure equitable distribution.

In a letter to the White House and the Centers for Disease Control and Prevention on Thursday, 10 senators wrote that it is critical that federal databases track robust demographic information to ensure at-risk communities are being vaccinated appropriately.

Black, Hispanic, and Native American communities have been disproportionately harmed by the COVID-19 pandemic, and yet, they are being vaccinated at significantly lower rates, wrote the senators, including Cory Booker (D-N.J.), Tammy Duckworth (D-Ill.), Alex Padilla (D-Calif.) and Raphael Warnock (D-Ga.).

The lawmakers noted that data on vaccination by race and ethnicity would help health officials ensure that vaccines are being distributed equitably and to work to overcome barriers to access.

The CDC reports that so far, over 47 million people in the U.S. have gotten at least one dose of a coronavirus vaccine.

While the agency released a report in early February on race and ethnicity in the first month of vaccinations, it is not publicly reporting such demographics on an ongoing basis, even as the rate of vaccination has sped up and eligibility has expanded in recent weeks.

In the CDCs February report, looking at the first 12 million people vaccinated mainly health workers and long-term care residents only half reported their race or ethnicity, and disparities were evident: Only 11.5% of those vaccinated were Latinx (the U.S. is 19% Latinx ) and 5.4% were Black (the U.S. is 13% Black).

Meanwhile, Black and Latinx people across the nation have been disproportionately impacted by the virus. They are three times as likely to be hospitalized as whites, and twice as likely to die .

The White House and CDC did not immediately respond to a request for comment.