Multiple choice general knowledge science & technology Who discovered Polio Vaccine? Jean-Baptiste Denys(France) Ivanovski and Bajernick(USSR,Netherlands) Minot and Murphy(U.S.A) Jonas Salk(U.S.A) Reveal answer Fill a bubble to check yourself D Correct answer Explanation Jonas Salk developed the first successful polio vaccine in 1955. His inactivated virus vaccine was tested in massive clinical trials and dramatically reduced polio cases worldwide. Salk became a medical hero for refusing to patent the vaccine.