Here is another of many,
JAMA Nov 2017
“Abstract
Importance Autism spectrum disorder (ASD) is known to be more prevalent among males than females in the general population. Although overall risk of recurrence of ASD among siblings has been estimated to be between 6.1% and 24.7%, information on sex-specific recurrence patterns is lacking.”
Since you are a special ed therapist (not sure if credentialed or not), you probably know that ASD is many times more prevalent in males than in females. This clearly is in line with the established conclusion that there is no link between vaccines and autism as it is primarily a genetic disorder.