{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,31]],"date-time":"2025-10-31T14:09:24Z","timestamp":1761919764643},"reference-count":11,"publisher":"FapUNIFESP (SciELO)","issue":"10","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Arq. Neuro-Psiquiatr."],"published-print":{"date-parts":[[2013,10]]},"abstract":"<jats:p> Objective Natalizumab is a new and efficient treatment for multiple sclerosis (MS). The risk of developing progressive multifocal leukoencephalopathy (PML) during the use of this drug has created the need for better comprehension of JC virus (JCV) infection. The objective of the present study was to assess the prevalence of JCV-DNA in Brazilian patients using natalizumab.   Method Qualitative detection of the JCV in the serum was performed with real-time polymerase chain reaction (PCR).   Results In a group of 168 patients with MS who were undergoing treatment with natalizumab, JCV-DNA was detectable in 86 (51.2%) patients.   Discussion Data on JCV-DNA in Brazil add to the worldwide assessment of the prevalence of the JCV in MS patients requiring treatment with natalizumab.<\/jats:p>","DOI":"10.1590\/0004-282x20130121","type":"journal-article","created":{"date-parts":[[2014,1,16]],"date-time":"2014-01-16T17:03:19Z","timestamp":1389891799000},"page":"780-782","source":"Crossref","is-referenced-by-count":7,"title":["Nearly one-half of Brazilian patients with multiple sclerosis using natalizumab are DNA-JC virus positive"],"prefix":"10.1590","volume":"71","author":[{"given":"Yara Dadalti","family":"Fragoso","sequence":"first","affiliation":[{"name":"Universidade Metropolitana de Santos,  Brasil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria Fernanda","family":"Mendes","sequence":"additional","affiliation":[{"name":"Santa Casa de Sao Paulo,  Brasil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Walter Oleschko","family":"Arruda","sequence":"additional","affiliation":[{"name":"Universidade Federal do Parana,  Brasil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jefferson","family":"Becker","sequence":"additional","affiliation":[{"name":"Pontificia Universidade Catolica do Rio Grande do Sul,  Brasil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joseph Bruno Bidin","family":"Brooks","sequence":"additional","affiliation":[{"name":"Universidade Metropolitana de Santos,  Brasil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Margarete de Jesus","family":"Carvalho","sequence":"additional","affiliation":[{"name":"Fundacao ABC,  Brasil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elizabeth Regina","family":"Comini-Frota","sequence":"additional","affiliation":[{"name":"Universidade Federal de Minas Gerais,  Brasil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Renan 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