The information was released by UCLA researchers at a meeting of the American Stroke Association in Fort Lauderdale on February 16, 2001. The silent episodes are thought to be rare before 30 but their incidence doubles every decade thereafter. With folks in their 70s, it is estimated that they will have a one in three chance of experiencing a silent stroke. The study being discussed was published in the journal Chest . ABC was following the controversy that surrounds SV40 and its possible origins in polio vaccines administered between 1955 and 1963.
Some researchers say it has always been in humans, but nobody looked for it.
Some say it came to our species from the kidneys of monkeys used to culture the polio vaccine and still others say it is in those born after 1963 due to maternal transmission. In 1961, the FDA told vaccine manufacturers to screen for SV40 which they say they did. Eight years ago, health care was at the top of the nation s agenda. Costs were soaring, as were the ranks of the uninsured. Now, costs are rising again, and the gap between the haves and the have-nots is worse than ever.