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No one knows. For example New Scientist Magazine
(May 27, 2000) in an article entitled "Behind
the Magic," Philippe Kourilsky, director of
the Paris-based Pasteur Institute discusses vaccinations
saying: "I'm amazed by the amount of basic
science we don't know."
In the same paper Neal Nathanson, director of the
US Office of AIDS Research says: The assumption
that successful vaccines work by simply producing
antibodies is almost certainly wrong.
The Hepatitis B vaccine, says Nathanson, possibly
works by:
Probably stimulat[ing] some protective effect
relying on killer T cells. But no one knows how
it does it or what exactly the process is - even
though the vaccine has been widely used for nearly
ten years. (http://www.newscientist.com:80/news/news_224027.html)
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