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On May 1, 2017, the Seattle and King County public health department in Washington was notified of possible infection with Baylisascaris procyonis in a previously healthy 19-month-old boy.
Several days earlier, the child was evaluated for a 1-week history of irritability progressing to tremors, ataxia, and decreased interactivity. During examination, he was afebrile but unable to sit or stand. A blood test revealed the presence of eosinophilia (absolute eosinophil count, 5080; reference range, 0–250), and an MRI showed diffuse white-matter lesions and patchy bilateral hemispheric enhancement. Cerebrospinal fluid (CSF) contained 4 white blood cells (reference range, 0–5), many of which were eosinophils. The parents reported seeing the child i…