Researchers compared children diagnosed with obsessive-compulsive disorder (OCD), Tourette syndrome, or other tic conditions with children without these conditions. They found that children with one of the disorders were twice as likely to have had a strep infection within three months of diagnosis.
But the link is still considered controversial by some in the field of childhood psychiatry.
More information can be found in this medically referenced article on Web MD
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Do you have any personal evidence of this finding?