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On May 1, 1956, Jonas Salk’s polio vaccine was officially made available to the public, marking a turning point in the fight against one of the 20th century’s most feared diseases. Polio had paralyzed and killed thousands—mostly children. Salk’s vaccine, developed through years of tireless research and not patented for profit, began large-scale distribution across the United States and soon the world. This event didn't just fight a virus—it sparked a global shift in public health and vaccine trust.