ResultsThe aOR (95% CI) of ASD associated with each 25-unit increase in total antigen exposure was 0.999
(0.994-1.003) for cumulative exposure to age 3 months, 0.999 (0.997-1.001) for cumulative exposure to age 7
months, and 0.999 (0.998-1.001) for cumulative exposure to age 2 years. Similarly, no increased risk was found
for autistic disorder or ASD with regression.
Conclusion In this study of MCO members, increasing exposure to antibody-stimulating proteins and polysac-
charides in vaccines during the first 2 years of life was not related to the risk of developing an ASD