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—I agree with Dr Poser that immunizations have a potential danger. We are, however, in substantial disagreement as to the methodology for documenting this danger. Dr Poser believes that case reports by individual practitioners provide suitable documentation; I do not. I insist on epidemiologic studies designed to show that neurologic manifestations attributed to immunization have a higher incidence in a vaccinated population than in a nonvaccinated one. One would not think that this position needs to be defended.
Fenichel GM. Vaccine Complications-Reply. Arch Neurol. 1983;40(12):774. doi:10.1001/archneur.1983.04050110092026
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