Tic is the contraction of a group of muscles as in an involuntary, rapid, intermittent, non-rhythmic, and repetitive manner. Genetic disorders are often thought to be responsible for tic though post-infectious etiology is also considered to be a cause of tic. In addition to A group B hemolytic streptococcus infection, the most commonly reported cause of tic, other infectious agents like herpes simplex, varicella zoster virus, borrelia burgdorferi, and mycoplasmas have also been reported to have caused tic. Although the etiology of the emergence of tic disorders after infections is not yet understood on cellular and molecular levels, autoimmune mechanisms and particularly several structural and functional problems in the cortico-striato-thalamo-cortical circuit in post-cerebellitis patients. In this case report, we present the case of a 7-year-old male patient, who developed chronic motor tic disorder after varicella zoster virus infection followed by cerebellar ataxia and at length, showed symptoms of attention deficit, hyperactivity disorder, and oppositional defiant disorder. To our knowledge, this case report will be one of the very few tic disorder cases developing after varicella zoster virus infection
Key words: Chronic Tic Disorder; Varicella Zoster Virus; Attention Deficit Hyperactivity Disorder; Varicella Cerebellitis.
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