A recenthuman study also showed that HHV-6 antigens detected in the parenchymaof IPF patient lungs localized to mononuclear inflammatory cells,potentially macrophages or lymphocytes.54 In our model, however, no lytic protein expression was detectedin CD3+ T cells or B220+ B cells, even if CD8+ T cells accumulatedin the lungs during establishment of latency. Here, PTPRC is linked to idiopathic pulmonary fibrosis.