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Opinion piece by Dr. Tim Lahey, an infectious-disease physician and vaccine researcher. He writes:
'Unproven vaccines have real risks. The 1976 swine flu vaccine was linked to a rare paralytic neurological illness called Guillain-Barré syndrome, arguably fueling vaccine mistrust that persists to this day. One novel H.I.V. trial was stopped early because certain vaccine recipients became more likely to be infected than placebo recipients. In trials of a vaccine against the syncytial respiratory virus, children who received the vaccine experienced enhanced disease that even lead to deaths. In each case, the immune response stimulated by the experimental vaccine was probably more harmful than helpful.'