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Autism prevalence increased rapidly in the late 1980s. The epidemic increased simultaneously in states across the United States, indicating that U.S. children were exposed to toxins in a consistent manner across the entire country. Due to the high adherence amongst the states to the CDC-recommended vaccination schedule, vaccines typically introduce a new exposure to children simultaneously throughout the country.
The phased introduction of the Hib vaccine in 1985-1990 and the universal introd…