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Varicella zoster virus (VZV) antigen in the temporal artery (TA) from a patient with pathologically-verified giant cell arteritis (GCA). Immunohistochemical analysis of a GCA-positive TA with mouse anti-VZV gE IgG1 antibody revealed VZV antigen in the adventitia (A, solid arrow) and media (A, dotted arrow) that was not seen when mouse isotype IgG1 control antibody (B) was substituted for mouse anti-VZV gE IgG1 antibody. 600× magnification.
