Ian A. York iayork at panix.com
Wed Mar 20 08:48:34 EST 1996

In article <4iov24$m7s at newsbf02.news.aol.com>,
JRicklefs <jricklefs at aol.com> wrote:
>How are vaccine's made?  I know some of them can be made by a weakened
>virus that is infected into a person then that person survives the
>weakened virus then is immune, but this doesn't work with all viruses why?

There are a couple of pieces at
that make a start at answering your questions.

      Ian York   (iayork at panix.com)  <http://www.panix.com/~iayork/>
      "-but as he was a York, I am rather inclined to suppose him a
       very respectable Man." -Jane Austen, The History of England

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