With the Zika virus pushing now vaccine preventable Ebola virus off the center stage in world health, it is easy to forget old diseases and debates. Vaccinations created by man, not by natural disease processes, have historically engendered controversy. According to Link (2005, p. 38), "vaccines are counterintuitive. What sense does it make to inject a well baby with a potent, biologically active vaccine that contains elements of the very disease it is supposed to prevent?"
