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| Description: The graph shows the parallel course of a child’s symptoms and the level of antistreptococcal DNA-B in her blood, which indicates the presence of an active infection. This relationship provides evidence that a group A β-hemolytic streptococcal infection can produce tics and the symptoms of OCD, presumably by affecting the basal ganglia. (Based on data from Perlmutter et al., 1998.)
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