William Osler on Vaccines By Vincent Iannelli, MD / September 18, 2016 August 10, 2019 / Gallop’s Island smallpox hospital, history of the anti-vaccine movement, Immanuel Pfeiffer, Osler Challenge, quotes, smallpox, vaccinated vs unvaccinated, vaccine challenge, William Osler Did William Osler call for the first vaccinated vs unvaccinated trial? Share this:FacebookTwitterRedditPrintLinkedInPinterestEmailTumblrWhatsAppLike this:Like Loading...