CXCL9 and myalgic encephalomeyelitis/chronic fatigue syndrome: Profiles of A-ME/CFS short-duration cases also differed from those of C-ME/CFS long-duration cases, with A-ME/CFS short-duration cases having lower levels of IL7 (P<0.0001), IL17 A (P=0.002), CXCL9 (P=0.004) and serpin E1 (PAI1; P=0.004).