You need to read up on your history instead of repeating what everyone else says.
In 1955, some batches of polio vaccine given to the public contained live polio virus, even though they had passed required safety testing. Over 250 cases of polio were attributed to vaccines produced by one company: Cutter Laboratories. This case, which came to be known as the Cutter Incident, resulted in many cases of paralysis. The vaccine was recalled as soon as cases of polio were detected.
https://www.cdc.gov/vaccinesafety/concerns/concerns-history.html
A whole list of messed up vaccines. They will eventually be adding all the covid vaccines. They have killed more people that any other.
I know about the Cutter Incident. This is where the manufacturers of the Polio vaccine did not kill the live virus with formaldehyde sufficiently. There have been modern day mistakes with the oral vaccines. Stupid stuff happens.