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When the vaccines had been tested properly over a long period of time, like the polio one.
by cxbates 6y ago
When the vaccines had been tested properly over a long period of time, like the polio one.
- yokaze 6y agoOr the Smallpox in 1905? https://www.history.com/news/smallpox-vaccine-supreme-court https://www.history.com/news/smallpox-vaccine-supreme-court