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Levels of interferon-γ (IFNγ) spot-forming cells in response to varicella zoster virus (VZV) stimulation. Numbers of IFNγ spot-forming cells/106 peripheral blood mononuclear cells in rheumatoid arthritis patients and healthy controls (HCs) in response to VZV stimulation were determined. Bars show the median and interquartile range. AID, autoimmune disease.
