The <a href="https://en.wikipedia.org/wiki/Polio_vaccine" id="mw2Q" rel="mw:WikiLink" title="Polio vaccine">polio vaccine</a>, developed by Dr. <a href="https://en.wikipedia.org/wiki/Jonas_Salk" id="mw2g" rel="mw:WikiLink" title="Jonas Salk">Jonas Salk</a>, is declared <a href="https://en.wikipedia.org/wiki/Jonas_Salk#Polio_research" id="mw2w" rel="mw:WikiLink" title="Jonas Salk">safe and effective</a>.