https://www.aamc.org/news-insights/here-s-why-we-can-t-rush-covid-19-vaccine
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Such tragic errors from inoculations against disease — this one from the polio vaccine developed by Jonas Salk, MD, in the 1950s, one of the most successful immunizations in history — help to explain why an anxious world must wait up to two years for a vaccination to shield people from the potentially fatal novel coronavirus.
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