While a small odds ratio and a high false-discovery rate (P value adjusted for testing 81 HLA types = 0.68) (Fig. S5), this finding was of particular interest as HLA-B*27 has been associated with nontyphoidal Salmonella-induced reactive arthritis and ankylosing spondylitis (15, –, 18). This evidence concerns the gene HLA-B and reactive arthritis.