In 1899, when Roswell Park, a well-known Buffalo surgeon, had argued that cancer would someday overtake smallpox, typhoid fever, and tuberculosis to become the leading cause of death in the nation, his remarks had been perceived as a rather “startling prophecy,” the hyperbolic speculations of a man who, after all, spent his days and nights operating on cancer. But by the end of the decade, Park’s remarks were becoming less and less startling, and more and more prophetic by the day. Typhoid, aside from a few scattered outbreaks, was becoming increasingly rare. Smallpox was on the decline; by
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