Comment: On TV a while back I saw a

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On TV a while back I saw a

On TV a while back I saw a program where someone sent a relative a piece of something containing smallpox that had been killed, and I can't remember if they were suppose to eat it or what but even though it was dead the immune system would produce antibodies so they would be immune to smallpox. Does anyone know what I'm talking about?
Would you be against this type of vaccination if an outbreak occurred since it has no harmful ingredients?