Perhaps even more threatening is that vulnerable populations tend to be harder to reach and more hesitant about receiving the vaccine.

Experts say that if these obstacles aren’t addressed early, the most vulnerable Americans — specifically people of color — will be left behind once again.

“The attention to this theme is because we all are nervous about those disparities persisting,” said Utibe Essien, a professor at the University of Pittsburgh School of Medicine.

What they’re saying: “If we’re sincere about prioritizing groups, we want to make sure the prioritized groups also take the vaccine,” said Harald Schmidt, a professor at the University of Pennsylvania’s Department of Medical Ethics and Health Policy. “This is a piece we haven’t actually done yet.”