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Comment & Response
September 2014

Relevance of CD34+ Cells as a Reservoir for JC Virus in Patients With Multiple Sclerosis—Reply

Author Affiliations
  • 1Department of Neurology, University of Texas Southwestern Medical Center at Dallas
  • 2National Institutes of Health, Bethesda, Maryland
JAMA Neurol. 2014;71(9):1192-1193. doi:10.1001/jamaneurol.2014.1858

In Reply In our article,1 we described the systematic, sensitive, and specific identification of JC virus, the etiologic agent responsible for the development of progressive multifocal leukoencephalopathy (PML), within circulating immune cells. Notwithstanding results in contradistinction to those we reported, Warnke et al appropriately acknowledged in their letter concerning our report that their study was confounded by an analysis of a significantly lower number of peripherally circulating immune cells. Their application of validated analysis techniques to compromised or inadequate samples ultimately culminated in their corresponding lack of ability to coelucidate the anticipated JCV and cytomegalovirus from the same tissues samples.

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