The Story of Measles’ Sharp Decline

In articles published last year in The Vaccine Reaction, “Polio Wasn’t Vanquished, It Was Redefined“1 and “The Salk ‘Miracle’ Myth,”2 I proposed that the reason the number of reported cases of polio in the United States declined so much in 1955—the year the Salk inactivated polio vaccine (IPV) was introduced—was due to the redefinition of polio by the U.S. government in 1954. As I noted in both opinion pieces, according to Dr. Bernard Greenberg, head of the Department of Biostatistics of the University of North Carolina School of Public Health:

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