>>11436831So these are specifically cell lines used for research. Essentially, most human cells cannot be grown repeatedly, save for some cells from cancer samples or fetuses, because they have a higher growth rate.
Because of this, vaccines and medicines are often tested on these cell lines, since they can be good models of humans, without requiring human testing at early and risky stages of drug development.
Luckily, these cell lines can be grown repeatedly, so the cells from a fetus aborted 20-60 years ago, can be re-grown and used in tests for thousands of different drugs. Occasionally, these cell lines lose the ability to continue growing, and must be replaced with new samples. Unfortunately, while some sources of these cells are reclaimed from abortions that would have happened normally, some are less ethically obtained, with the most recent one in China being accused of possibly pressuring the mother and changing abortion procedure.
http://ethicalresearch.net/positions/the-ethics-of-the-walvax-2-cell-strain/ Overall, there might be around 20-40 fetuses used in the creation of all cells for all vaccine testing in the world in the last 60 years. There is almost certainly no fetal cells or remains in the actual vaccines. Though knowing this information, you can make your own ethical call.
