This thread is related to the article I uploaded to the forum. I would like to know whether a number of markers that I propose at the end of the article are met. It is aimed at people who have had CFS post-Epstein Barr virus infection. I therefore propose that we pool these markers in order to be able to classify this sub-group of CFS. I would like each person to put the following: - Pathogen causing your CFS: EBV - Number of antibodies against EBNA IgG. These antibodies to this latent protein should be elevated due to chronic latent infection, as in multiple sclerosis. - Number of activated T-lymphocytes CD3 + HLA-DR +. They should be decreased by the expression deficit of MHC class II molecules. - Molecular typing of the HLA system. For example: HLA-DR15 and HLA-DQ6 predispose to developing multiple sclerosis but together with more factors. Depending on the type of HLA it will indicate a greater or lesser genetic susceptibility to have difficulties in controlling this infection. HLA-DR would be the most interesting type of HLA in this case, because DR is a class II MHC molecular type. If you have any questions or doubts, ask me by this thread. Greetings and thank you very much for your cooperation.