This is an RFK letter in response to a critic who did not address RFK's supporting information. (...) Similarly, in 1977, Boston University epidemiologists (and husband and wife) John and Sonja McKinlay published their seminal work in the Millbank Memorial Fund Quarterly on the role that vaccines (and other medical interventions) played in the massive 74% decline in mortality seen in the twentieth century: “The Questionable Contribution of Medical Measures to the Decline of Mortality in the United States in the Twentieth Century.” In this article, which was formerly required reading in U.S. medical schools, the McKinlays pointed out that...