International Multicentric Observational Study to Characterize Subpopulations of Patients With Autism Spectrum Disorder

Inclusion Criteria:

• Participants previously diagnosed with ASD (DSM-5)

• Available well-documented health records within the first 2 years of life

• Participants must have a parent or reliable caregiver who agrees to provideinformation about the participant

• Participants willing and consenting or assenting to participate.

Exclusion Criteria:

• Episode of fever (i.e. ≥100.5 °F or ≥ 38 °C) or clinically significant illnesswithout fever (as judged by the investigator), within 10 days before any studyassessment.

• If the investigator assesses any unwillingness or any medical condition that mayprevent the subject from completing this study.