Which Christians refuse vaccinations on religious grounds?

There are reports of a measles outbreak in a Christian school in British Columbia, Canada . News reports speak of this as a community with "traditionally low vaccination rates" and say that many parents do not vaccinate their children on religious grounds. I'm unaware of any Christian group that prohibits vaccinations, or any line of theological reasoning that would lead to an issue with vaccinations. Wikipedia doesn't mention anything . Even Amish and Old Order Mennonites appear to go along with vaccinations . Who are the groups that take this stand, and what is their theological reasoning?