Division of Immunology;
Faculty of Chemistry;
Biochemistry and Phar-macy;
National University of San Luis;
San Luis;
Argentina;
Laboratory of Immunopathology;
Multidisciplinary Institute of Biological Investiga-tions-San Luis (IMIBIO-SL);
National Council of Scientific and Technical Investigations (CONICET);
San Luis;
Argentina;
Reactive; Arthritis; HLA-B27; Spondyloarthritis; Yersinia-Induced; ReA; Therapy;