AdvertisementCDC Investigates Cases Of Rare Neurological 'Mystery Illness' In KidsOctober 16, 2018Joe NeelAllison AubreyfacebookEmail"I am frustrated that despite all of our efforts, we haven't been able to identify the cause of this mystery illness," said Dr. Nancy Messonnier, director of the National Center for Immunization and Respiratory Diseases at the Centers for Disease Control and Prevention. (James Leynse/Corbis/Getty Images)