title: Regarding the ankylosing spondylitis/Klebsiella/HLA-B27 problem.
mesh_terms: D003429:Cross Reactions; D006680:HLA Antigens / Q000276:immunology*; D015796:HLA-B27 Antigen; D006801:Humans; D007711:Klebsiella pneumoniae / Q000276:immunology*; D013167:Spondylitis, Ankylosing / Q000276:immunology*
chemical_list: D006680:HLA Antigens; D015796:HLA-B27 Antigen