21.   In February, Wistar provided the tiny amounts of remaining polio vaccine to Dr. Vincent Racaniello at the Columbia University College of Physicians and Surgeons in New York.

22.   In taped memoirs recorded for his family, Korns recalled his involvement in testing the polio vaccine as the pinnacle of his career.

23.   In preparing the material for the independent laboratories, the Wistar Institute will include samples other than polio vaccine for purposes of scientific controls.

24.   In the light of earlier, smaller test projects, the polio vaccine had seemed likely to be safe and highly effective.

25.   Indeed, as polio vaccines are about to eliminate the disease from the world, scientists still do not fully understand how polio vaccines work.

26.   It is derived from a synthetic protein, not a live virus like the polio vaccine.

27.   It was two years before polio vaccine became available, says Bee, a fact that still makes her cry.

28.   Like oral polio vaccines, the nose-spray flu vaccine is made of live but weakened flu viruses, Piedra said.

29.   Many of those who have the tumors did not have the Salk polio vaccine, so another method of how the virus was transmitted needs to be discovered.

30.   Monkey cells were routinely used to make polio vaccines then and now.