CD8A and myalgic encephalomeyelitis/chronic fatigue syndrome: For example, hsa-miR-99b and hsa-miR-330-3P in B cells; miR-21 in CD8+T cells; hsa-miR-99b, hsa-miR-330-3P, miR-21, miR-17-5p, miR-10a, miR-103, miR-152, miR-146a, miR-106, miR-223, mi R-191, hsa-miR-30c and hsa-miR-126 in NK cells can be effective biomarkers of CFS.