I had never heard this before and figured this may spark a discussion among you wonderfully intelligent and resourceful greeks!
The CDC is aware that some, but not all, vaccines are made from human cell-line cultures, and some of these cell lines originated from aborted fetal tissue, obtained from legal abortions. Cell lines generated from a single fetal tissue source are used--vaccine manufacturers obtain human cell lines from FDA-certified cell banks that use aborted babies.
See the CDC's own website:
http://www.cdc.gov/nip/vacsafe/conce.../humancell.htm