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A laboratory test developed by scientists at the National Institute of Neurological Disorders and Stroke (NINDS) is helping clinicians around the world in diagnosing a rare and potentially life-threatening brain disease called progressive multifocal leukoencephalopathy (PML). The test, or assay, can quickly and precisely detect trace amounts of the virus responsible for PML.

In recent years, cases of this little known condition have appeared in some individuals receiving certain types of monoclonal antibody therapies, cutting-edge medications that can successfully treat multiple sclerosis (MS), Crohn’s disease, rheumatoid arthritis and other autoimmune disorders. For medical teams who monitor and safeguard the health of patients on these medications, the NINDS innovation has become an important resource...Read More - http://www.msrc.co.uk/index.cfm/fuseact ... ageid/1905

I didn't know this was news. My Doctor (in New York) ran the JC test on me when we started looking at Tysabri. I'm JC negative but we're not sure if I'm progressing or not yet (turns out a lot of me newer symptoms are probably related to a slipped disc in my neck. which is a total bitch, having MS and something else giving me fake MS symptoms)