: What percentage of vaccines are deemed unsafe at which stage in the testing? What percentage of vaccines are deemed unsafe at what stage of the testing? Is it common that vaccines reach stage 2 for example and are deemed

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What percentage of vaccines are deemed unsafe at which stage in the testing?
What percentage of vaccines are deemed unsafe at what stage of the testing?
Is it common that vaccines reach stage 2 for example and are deemed unsafe there? What about vaccines making it to stage 3?
I am most interested in whether the vaccine failed for being unsafe rather than ineffective but a great answer would of course include all these percentages.

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