About 66% of Americans are fully vaccinated. But as the United States approaches a million deaths from COVID-19, the virus mortality rate is being driven mainly by people who are not vaccinated, according to the Centers for Disease Control and Prevention. Nationally, about one in six Americans say they “definitely will not get the vaccine,” according to the Kaiser Family Foundation.

“One thing that has been really consistent in all of our surveys is the size of the group that says they’re definitely not getting vaccinated,” says Liz Hamel, vice president and director of public policy and survey research at KFF. “That hasn’t shifted in over a year.”

“The ones that have been most likely to say they’re definitely not going to get the vaccine have been Republicans and people living in rural areas, as well as white evangelical Christians,” she says.

Kaiser’s survey data shows that 20 percent of those who say they’ll never get the vaccine identify as Democrats or politically independent, and 28% live in cities or suburbs.