Vaccines do not cause autism. In fact, there is no evidence that any of the vaccines being given to school children causes autism.
Autism is caused by genetic and environmental factors. Vaccines simply do not fit into the equation. Autism is a neurobiological disorder and is not easily prevented or treated with vaccines. Autism rates actually increased dramatically in the years immediately following the introduction of immunizations for several different infectious diseases, including polio and diphtheria. The actual number of cases has since stabilized, but this may be because autism has been diagnosed on a more severe scale due to better diagnostic tools and practices.