The Hib and Hepatitis B vaccines were introduced in 1985-1991. The phase-in of these vaccines in the subsequent years after introduction closely aligns with the rapid increase in autism prevalence, per this graph from Nevison . It is hypothesized that the increase in abnormal immune activation in infancy from these two vaccines, potentially amplified by the increased use of aluminum adjuvant in vaccines , contributed to the autism epidemic. Have there been any epidemiological studies that have studied this question?
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