A case of natalizumab-associated progressive multifocal leukoencephalopathy with repeated negative CSF JC virus testing. Mazda ME, Brosch JR, Wiens AL, Bonnin J, Kamer AP, Mattson DH, Snook RJ Int J Neurosci. 2012 Dec 20. PMID: 23252596. Abstract CommentRecommendBookmarkWatch