Abstract
Infantile autism was diagnosed by DSM-III criteria in 132 children (26 girls) who were outpatients of the Tsuchiura Child Guidance Center during the years 1977–1985. The children, all Japanese except for one Laotian boy born in Laos, were classified according to year and month of birth. The prevalence rate of infantile autism in southern Ibaraki, Japan, within the birth cohort born between 1972 and 1978 was 13.9/10,000 children. The month of birth for infantile autism increased in the second quarter of the year. The prevalence rate of infantile autism in each 1-year birth cohort fluctuated in a 4-year cycle, which was closely correlated (r=.92) with the number of cheldren admitted with pneumonia and bronchiolitis in that area. These findings led us to postulate that infectious factors of children's pneumonia and bronchiolitis may have some role in the cause of infantile autism.
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Tanoue, Y., Oda, S., Asano, F. et al. Epidemiology of infantile autism in southern Ibaraki, Japan: Differences in prevalence in birth cohorts. J Autism Dev Disord 18, 155–166 (1988). https://doi.org/10.1007/BF02211943
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DOI: https://doi.org/10.1007/BF02211943