Nearly one-half of Brazilian patients with multiple sclerosis using natalizumab are DNA-JC virus positive. Fragoso Y D, Mendes M F, Arruda W O, Becker J, Brooks J B B, de Carvalho M J, Comini-Frota E R, Domingues R B, Ferreira M L B, Finkelsztejn A, et al. Arq Neuropsiquiatr. 2013 Oct; 71(10):780-2. PMID: 24212514. Abstract CommentRecommendBookmarkWatch