[observation, 2015] We no longer see children stricken with polio in wheelchairs or hear of those suffocating from diphtheria, of babies born to mothers with rubella whose eyes are clouded by cataracts and hearts deformed. The success of protecting against such pathogens has removed a sense of their immediacy and caused many to forget their horror. But that may change, as we receive reports of outbreaks of infection due to unvaccinated children and their mothers.