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"Decades ago, children received only a small fraction of the vaccines required today. In those times, people were much healthier." President Trump pointed to rising autism rates as he questioned today's childhood vaccine schedule, saying, "We did not know exactly what the cause is with respect to autism." "It is essential to our research efforts that we have the very best vaccine recommendations in the entire world," Trump said, calling for vaccines to be reduced or spread out over a longer period.