When a person is vaccinated with a suspension of killed or weakened virus particles, his system is stimulated to produce antibodies against that particular virus. If he should later be infected with the same kind of virus in the wild, full-strength form, his system "remembers" the vaccination, quickly pours out a flood of antibody to halt the invader in its tracks. At any rate, that is how most vaccinations have long been supposed to work. But are things really that neat and simple?
No, say many immunologists, and last week Manhattan's Dr. Jonathan...
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