This may be very helpful to those researching vaccines.
I am particularly struck by this quote, from the FDA in June of 1984:
Department Of Health And Human services, Food and Drug Administration, 21 CFR Part 630 [Docket No. 84N-0178]
“...any possible doubts, whether or not well founded, about the safety of the vaccine cannot be allowed to exist in view of the need to assure that the vaccine will continue to be used to the maximum extent consistent with the nation's public health objectives.” (bolding mine)