Thanks for pointing out the Cutter Incident ... an example of how, at the start, some stumbles - including deaths - are inevitable. (Wyeth too had 'excess deaths'.)

'All five companies that produced the Salk vaccine in 1955—Eli Lilly, Parke-Davis, Wyeth, Pitman-Moore, and Cutter—had difficulty completely inactivating the polio virus."

[https://en.wikipedia.org/wiki/Cutter_Laboratories#Cutter_inc...] [https://archive.org/details/cutterincidentho00offi/page/100]

In the long run, the polio vaccines were unquestionably effective. In the US: 58,000 cases in 1952; 5600 cases in 1957. Salk led to Sabin - who did his trial tests in the USSR and Mexico (ethical?) - and by 1964 there were 124 US cases.

[http://www.eds-resources.com/poliotimeline.htm]

What stinks much more to me is consensus-building by people seeking a political advantage. The result has been many more deaths than 70 years ago.