In ME/CFS patients, baseline serum BAFF levels did not correlate significantly with HLA-DR on T-cells, for HLA-DR (%CD4) r = 0.29, p = 0.18, and for HLA-DR (%CD8) r = 0.26, p = 0.16. This evidence concerns the gene CD4 and myalgic encephalomeyelitis/chronic fatigue syndrome.