Journal
JOURNAL OF VIROLOGY
Volume 87, Issue 10, Pages 6055-6059Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JVI.00131-13
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Progressive multifocal leukoencephalopathy (PML) is the main adverse effect of natalizumab. Detectable JC virus-specific effector memory T-cell (TEM) responses may indicate ongoing JCV replication. We detected JCV-specific TEM responses in blood of patients with multiple sclerosis (MS) treated with natalizumab, including 2 patients with PML. The frequency of detection of these responses increased with the time on natalizumab. Thus, a subset of MS patients exhibit immunological hallmarks of JCV replication during prolonged natalizumab therapy.
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