Four nurses at a rural health department in Kansas are refusing to administer any COVID-19 vaccines, citing the fast development and production of the shots.

Coffey County Public Health Administrator Lindsay Payer said the nurses made their own decisions and expressed their concerns one by one. She called the vaccine documents concerning.

“I strongly feel that if people want this vaccine, they should receive it. Absolutely,” Payer said. “But just like it’s their choice to receive it or not, I feel like it should also be my choice to give it or not.”

None of the nurses, including Payer, feel “comfortable” administering a vaccine that has gone through a speedy testing process with new technology, the Kansas City Star reported.