That's Thalidomide which wasn't a vaccine. A more relevant example is Pandemrix, a flu vaccine launched in the EU in 2009. A year later it was discovered that

That's Thalidomide which wasn't a vaccine. A more relevant example is Pandemrix, a flu vaccine launched in the EU in 2009. A year later it was discovered that it seems to increase the risk of narcolepsy in teenagers sixfold. The vaccine was produced and licensed in an expedited fashion because of a "pandemic" (of swine flu), which used a then-new and slightly experimental technique (adjuvants) which interestingly, German doctors flagged up as a risk and suggested the German government use a different H1N1 vaccine that was less experimental.