John R. Paul
... that virologist John R. Paul blamed better hygiene for polio's spread in the 20th century, saying early exposure to poliovirus would have given immunity?
... that <a href="./Virology" id="mwHtk" rel="mw:WikiLink" title="Virology">virologist</a> <b id="mwHto"><a href="./John_R._Paul" id="mwHts" rel="mw:WikiLink" title="John R. Paul">John R. Paul</a></b> blamed better hygiene for <a class="mw-redirect" href="./Poliomyelitis" id="mwHtw" rel="mw:WikiLink" title="Poliomyelitis">polio</a>'s spread in the 20th century, saying early exposure to <a href="./Poliovirus" id="mwHt0" rel="mw:WikiLink" title="Poliovirus">poliovirus</a> would have given immunity?