Two filmmakers explore a controversial theory about the beginnings of the disease. In the 1950s, American and Belgian missionaries in the Belgian colonies of the Congo widely distributed polio vaccine to a million children in a bid to wipe out the crippling disease; however, evidence now suggests that Dr. Koprowski's oral vaccine may have been tainted, and that the first instances of the disease may be linked to these inoculations.
freedocumentaries.org/film.php?id=123
here it is watch en.wikipedia.org/wiki/Hilary_Koprowski#Biography
I bet you POles dont want to talk about this staff do you ???