Beginning in 1998, infectious disease and mental health experts have identified children who develop symptoms of obsessive-compulsive disorder (OCD) or tic disorders such as Tourette’s syndrome after an infection. First thought to be linked only to the group A streptococcus bacteria that cause strep throat or scarlet fever, it has been seen with other kinds of infections. Experts propose calling this frightening disorder pediatric acute-onset neuropsychiatric syndrome (PANS). It probably happens when the infectious agent gets into the brain and inflames the basal ganglia. Rapid treatment with antibiotics can reverse the symptoms.