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It mostly affected children and you could see the negative results walking down the street.
That "trust " of the "fully tested " vaccine went out the window when the Salk vaccine had a batch that killed a small number of people. Idaho was hit hard. The US stopped vaccinations. It is known as the "Cutter" incident. It basically ruined the reputation of the Salk vaccine.
Due to the distrust a rival vaccine, Sabin (weakened virus) stepped up and became the go to vaccine.
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