"18-6 Vaccines ok on temporary basis if no other moral alternative available to fetal stem cell lines “Parents and physicians may use the current vaccines without immoral cooperation in abortion “on a temporary basis” when no ethical alternative is available and “insomuch as is necessary in order to avoid a serious risk not only for one’s children but also…for the health conditions of the population as a whole”. When no other ethical alternative is available, “it is right to abstain from using these vaccines if it can be done without causing children, and indirectly the population as a whole, to undergo significant risks to their health”. (2005) (renewed 2015)"