The first mass inoculation of children against <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Poliomyelitis" id="mwAQY" rel="mw:WikiLink" title="Poliomyelitis">polio</a> with the <a href="https://en.wikipedia.org/wiki/Jonas_Salk" id="mwAQc" rel="mw:WikiLink" title="Jonas Salk">Salk</a> <a href="https://en.wikipedia.org/wiki/Vaccine" id="mwAQg" rel="mw:WikiLink" title="Vaccine">vaccine</a> begins in <a href="https://en.wikipedia.org/wiki/Pittsburgh" id="mwAQk" rel="mw:WikiLink" title="Pittsburgh">Pittsburgh</a>.