Distribution of optical density minus background readings for the anti-HERV-K10 Gag peptide ELISA antibody assay performed at a dilution of 1:200 among the various subject populations. The horizontal bars represent the means for each group and each dot represents one subject. Values below the threshold for positive are shown at the bottom. The means for VBD, LGLL, HTLVt, HTLVm, HTLVn and MS subjects were 0.027, 0, 0.142, 0.598, 0.016 and 0.017, respectively. VBD vs. LGLL, p = 0.002; VBD vs. HTLVt, p = < 0.001; VBD vs. HTLVm, p = < 0.001; VBD vs. HTLVn, p = < 0.001; VBD vs. MS, p = 0.331; HTLVm vs. HTLVn, p = < 0.001.