What happens if/when we are using aborted babies and placing them in human vaccines, medicines, etc.? Is it possible for Kuru to develop from that, especially if baby brains are involved?
(that is so sick a thought, but still...)
Good thing that isn't ever done. Fetal stem cells are sometimes used in the research and development process or in the testing process. The stem cell lines are most often from either they kidneys or livers. They aren't used in any products because there's no purpose for them to be there. They're used because they multiply rapidly and indefinitely and are a perfect model for human cell behavior as it relates to cellular entry, viral replication, and other processes.
Further, there are more companies moving away from using fetal stem cells at any stage of the process, which is fantastic news. Pfizer, Moderna, and Novavax did all their internal R&D and testing for their COVID-19 vaccines without using fetal stem cells. J&J did use fetal stem cells for their R&D and testing with their COVID-19 vaccine, but again, not in the actual product that's put into people, because there's no reason or point to put them it in there.