{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T01:38:59Z","timestamp":1790127539725,"version":"4.0.1"},"reference-count":10,"publisher":"SAGE Publications","issue":"11","license":[{"start":{"date-parts":[[2013,3,4]],"date-time":"2013-03-04T00:00:00Z","timestamp":1362355200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Mult Scler"],"published-print":{"date-parts":[[2013,10]]},"abstract":"<jats:p>JC virus (JCV) is an opportunistic virus known to cause progressive multifocal leukoencephalopathy. Anti-JC virus (Anti-JCV) antibody prevalence in a large, geographically diverse, multi-national multiple sclerosis (MS) cohort was compared in a cross-sectional study. Overall, anti-JCV antibody prevalence was 57.6%. Anti-JCV antibody prevalence in MS patients ranged from approximately 47% to 68% across these countries: Norway, 47.4%; Denmark, 52.6%; Israel, 56.6%; France, 57.6%; Italy, 58.3%; Sweden, 59.0%; Germany, 59.1%; Austria, 66.7% and Turkey, 67.7%. Prevalence increased with age (from 49.5% in patients &lt; 30 years of age to 66.5% in patients \u2265 60 years of age; p &lt; 0.0001 comparing all age categories), was lower in females than in males (55.8% versus 61.9%; p &lt; 0.0001) and was not affected by prior immunosuppressant or natalizumab use.<\/jats:p>","DOI":"10.1177\/1352458513477925","type":"journal-article","created":{"date-parts":[[2013,3,5]],"date-time":"2013-03-05T04:21:33Z","timestamp":1362457293000},"page":"1533-1538","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":94,"title":["Anti-JC virus antibody prevalence in a multinational multiple sclerosis cohort"],"prefix":"10.1177","volume":"19","author":[{"given":"Tomas","family":"Olsson","sequence":"first","affiliation":[{"name":"Center for Molecular Medicine, Karolinska Hospital, Stockholm, 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