The most highly respected public health agencies and professional medical associations have rigorously studied the safety of the Hepatitis B vaccine. According to the World Health Organisation (WHO), the U.S. Centers for Disease Control and Prevention (CDC), and many different medical societies have concluded that there is no confirmed evidence that the Hepatitis B vaccine causes: autism, autoimmune disorders, chronic fatigue syndrome, chronic illness, guillian-barre syndrome, multiple sclerosis, optic neuritis, rheumatoid arthritis, seizures, sudden infant death syndrome (SIDS), or transverse myelitis.