Here are some examples of past problems with vaccines:
www.ncbi.nlm.nih.gov
In 1976, concerns in the United States about a possible influenza pandemic involving a virus similar to the deadly 1918 pandemic strain resulted in a large-scale vaccination program for the entire country. Approximately 45 million people were vaccinated in 10 weeks with what became known as the “swine flu vaccine” [16]. The US government abruptly stopped the vaccination program when no swine flu cases were detected outside the military base where the disease originated and when an unexpectedly high number of cases of Guillain-Barré syndrome were reported in vaccinated individuals. The vaccine was estimated to have caused approximately one Guillain-Barré syndrome case per 100,000 persons vaccinated [17], resulting in 53 deaths [18]. As a result of the association between the 1976 swine flu vaccine and Guillain-Barré syndrome, this condition is closely monitored every influenza season as part of the influenza vaccine safety monitoring in the United States.
Deaths following vaccination: What does the evidence show? - PMC
Vaccines are rigorously tested and monitored and are among the safest medical products we use. Millions of vaccinations are given to children and adults in the United States each year. Serious adverse reactions are rare. However, because of the high ...
2. Historical events
In the era of modern medicine, some of the first concerns about vaccines causing death date to isolated, but high profile past vaccine safety incidents. The “Cutter Incident” in 1955 involved a flaw in the Salk polio vaccine manufacturing process at Cutter Laboratories that led to production of substantial amounts of what was thought to be inactivated vaccine that contained live poliovirus. The result has been called “…one of the worst pharmaceutical disasters in US history”[11], with 40,000 cases of polio resulting in 51 cases of permanent paralysis and five deaths among vaccinated individuals, and 113 cases of paralysis and five deaths among contacts of vaccinated individuals [11,12]. As a result of the Cutter Incident, the US government implemented much more vigilant monitoring and regulation of the vaccine industry [13]. The Food and Drug Administration (FDA) now requires extensive testing to evaluate the safety and efficacy of vaccines prior to licensure. After licensure, FDA requires ongoing lot-release testing and manufacturing facility inspections. Additionally, manufacturers are required to conduct post-licensure safety monitoring for their products and report to the FDA [14,15].In 1976, concerns in the United States about a possible influenza pandemic involving a virus similar to the deadly 1918 pandemic strain resulted in a large-scale vaccination program for the entire country. Approximately 45 million people were vaccinated in 10 weeks with what became known as the “swine flu vaccine” [16]. The US government abruptly stopped the vaccination program when no swine flu cases were detected outside the military base where the disease originated and when an unexpectedly high number of cases of Guillain-Barré syndrome were reported in vaccinated individuals. The vaccine was estimated to have caused approximately one Guillain-Barré syndrome case per 100,000 persons vaccinated [17], resulting in 53 deaths [18]. As a result of the association between the 1976 swine flu vaccine and Guillain-Barré syndrome, this condition is closely monitored every influenza season as part of the influenza vaccine safety monitoring in the United States.
