As part of the original study to longitudinally characterize the CD4+/CD8+ T-cell repertoires in drug reaction with eosinophilia and systemic symptoms (DRESS) from diagnosis to clinical remission, CD4+ and CD8+ T-cells from peripheral blood of DRESS patients were isolated at 10-day intervals, and sequenced CDR3-regions of the TCRB chain on Ion Torrent PGM platform (Life Technologies, Carlsbad, CA, United States). The gene discussed is CD4; the disease is Increased total eosinophil count.