Thimerosal contains mercury.
Mercury is a toxic metal that can cause immune, sensory, neurological, motor, and behavioral dysfunctions. Autism is a neurological disorder that usually manifests itself in the first two years of life and is characterized by sensory, neurological, motor, and behavioral dysfunctions . Autism currently ranks third among child development disorders. Much research is presently focused on links between thimerosal and autism. Despite this new evidence, thimerosal is still being used in many vaccines.