AAP News Vol. 15 No. 12 December 1999, p. 24
© 1999 American Academy of Pediatrics
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Evidence shows genetics, not MMR vaccine, determines autism

Charles G. Prober M.D., FAAP

Before measles vaccine was licensed in the United States in 1963, some 400,000 cases of measles were reported on average each year. Yet because virtually all children contracted measles, the actual number of cases probably approached that of the entire birth cohort (3.5 million to 4 million cases per year).

By the early 1980s, however, the annual incidence of reported measles cases had been reduced by more than 99 percent, to less than 1,500 cases.