On April 12, 1955 the government announced the first vaccine to protect kids against polio. Within days, labs had made thousands of lots of the vaccine. Batches made by one company, Cutter Labs, accidentally contained live polio virus and it caused an outbreak.
Source:
- September 1, 2020. Jen Christensen CNN. “Past Vaccine Disasters Show Why Rushing a Coronavirus Vaccine Now Would Be ‘Colossally Stupid.’” CNN.
https://www.cnn.com/2020/09/01/health/eua-coronavirus-vaccine-history/index.html.
News.