The trouble with many live-virus vaccines is that the viruses of which they are made multiply in the body in such away as to cause illness. As a result, some measles vaccines produce what seems like a mild case of measles; some polio vaccines may make the vaccinee infectious to others. Virologists have long sought a way to deliver the live (though possibly weakened) virus of a vaccine into a part of the body where it will cause neither symptoms nor infection, but will still do its job of triggering antibody formation.
Last week Government doctors announced that they had...
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