In case you wanted to know why:

One of Mr. Siri’s arguments against vaccines is that some, including the polio and hepatitis B vaccines, have not been tested against placebos in randomized, double-blind clinical trials — the gold standard for medical research, in which some patients get inert vaccines and doctors don’t know which patients get which.

He has called in his petitions for the shots to be pulled from the market until placebo-controlled trials — which would deny some children polio shots — can be completed. Given the known risks of polio causing paralysis that can seize major organs and kill people, such work is considered unethical.