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The CSFJC virus (JCV) antibody index (AIJCV) values and the JCV DNA results by polymerase chain reaction of all 37 natalizumab-progressive multifocal leukoencephalopathy cases are shown in an x–y diagram. AIJCV values and JCV DNA level did not correlate (Spearman r = 0.095, 95% confidence interval = −0.415 to 0.246). CSF = cerebrospinal fluid.
